There are more transformation games out there than ever before! From popular favorites to hidden gems, you shouldn’t miss out on any of them. So here are Team TF Gamer’s favorites. We’ll share what makes each one great, along with what kinds of TFs you can expect to see. So without further ado, and in no particular order, here are the top 25 transformation games. (Warning – more than a few of these games are NSFW!)

1. Flash Muscle Growth Games
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3. Grow Flash Game
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5. Women Muscle Growth Game

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Mice Tea by Cinnamon Switch

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Mice Tea is a visual novel game set in a modern day setting following the adventures of Margaret and an unusual brand of tea. From there it sets off a cascade of events that you get to choose how they play out. While the TF content is very light in this preview of the game overall it has quite the nice little set up!

The cast of characters range are mostly early twenty somethings dealing with life in their own ways. As for the TF content of the game most of it revolves around the main character transforming into a mouse via a tea. Quite simple right? Well the tea seems to have different effects on different drinkers.

Throw in a bit of transformation of gender and a bit of shrinking and that rounds out about most of the TF found in this game. For a freely developed game it has quite a pleasant sound track and overall the art assets are quite cute! No two characters in the story look the same and all talk very distinctly from one another.

While a tad short it is only a preview of the madness that could come about later. A word of warning however, there is explicit content within this game. Almost all in sexual content but, nothing too extreme.I for one am certainly looking forward to the rest of this game and you can follow the development of this game here!

TF Card Battle by ApolloSeven

TF Card Battle in layman’s terms is a fusion of Slay the Spire and Dominion with transformation based storytelling; with very erotic imagery and gifs throughout. While the game itself is still in active development the game feels form complete; maybe tweaking card values here or there. The variety of transformation’s on display mostly have Male to Female in mind however, the transformations you can force upon your opponent and yourself is quite varied.

Rule’s are quite simple, you spend currency to buy cards to further build up your own deck to better transform and change you emeny. What cards you get however is completely up to you. If you stay towards more brainy cards you can get latter benefits and synergies to help keep your own transformation low. However if you dig in and use lust cards you can get extra draw and deck control for cheaper but, run the risk of being transformed. From there it’s all about what deck theme you pick.

Wanna turn someone into a big breasted bimbo, done. Wanna transform into a witch and cast spells on folks, done. Wanna see someone turn into a human-cow (Humcow in game) done. With such a solid base for the game to stand on it surely is on its way to be one of the better in development games out of TFgamesite. And if you would like to learn more, please click here for a more comprehensive review!

Growth Academy by The Soylent Orange

Growth Academy is a dating sim visual novel which features 6 different romanceable characters, each of which has a different “growth” factor. Choose from weight gain, muscle growth, breast expansion, ass expansion, giantess, and more.

There’s a lot of love here, in more ways than one. The game features a ton of high quality art, sound effects, character cutscenes, and more. It’s currently an unfinished extended demo, but it’s easy to tell the game is headed for great things.

Monster Hearts 2 by Avery Adler

Monster Hearts is a tabletop RPG based off of the Apocalypse ruleset. The central dynamic is secret identities and slow transformations, with characters becoming werewolves, vampires, snake folk, demons, ghouls, and other kinds of monsters. The developer has taken a lot of care to help facilitate love triangles for the players, support options for LGBTQ and poly relationships, and more.

The reason why Monster Hearts (as well as the other games by Avery Adler) really shine is that they help redefine the RPG genre beyond simply “Orc Holocaust” and into something profound. For example, she one said: “The fun/dangerous thing about game design is you can say things like ‘time doesn’t heal wounds’ and it’s not, like, an opinion. it’s a rule.” Get ready for an intense, emotional experience.

Hordes by Privateer Press

You see that picture up there? Those are Incubi, a Legion of Everblight unit and they are easily some of the best sculpted examples of bodyhorror and monstrous transformation you’ll find in any miniatures game. Legion of Everblight is one of many factions in this tabletop skirmish game. In the Hordes setting dragons are basically Lovecraftian horrors, corrupting and changing everything they touch. Followers of the dragon Everblight are all in the process of transforming into more dragon-like forms and the sculpts of the miniatures reflect this.

Other miniatures in the faction display mutations such as additional limbs, horns, vestigial wings, but the Incubi are one of the most dramatic examples. Legion isn’t the only faction with a transformation bent either, there’s also Circle Orboros which features Warpwolves and Warpborn, which are giant werewolves in a perpetual state of flux, constantly undergoing new mutations to make them even more fearsome in battle. In terms of game play this means that each turn you get to choose how the Warpwolves mutate. Circle Orboros also features the Tharn, bloodthirsty berserkers who transform into bestial giants.

In the case Kromac the Ravenous the transformation is represented by using two separate miniatures, one for his normal state and one for his transformed state. Miniatures in all of the factions have very impressive sculpts and the game is very easy to pick up and play with starter boxes existing for each faction. Privateer Press also sponsors regular events at local gaming stores to teach new players the game and provide a friendly and welcoming community. There are other tabletop games with transformation elements, but Hordes stands out for how it combines dynamic miniatures and transformation mechanics.

Vale City: Rise of the Fetish Companyby Narukami92

Vale City is an RPG featuring WG and extreme body growth in general. It has an open world and tons of NPCs for an extremely immersive experience, with hours upon hours of playtime. But what sets this game apart is the amazing love that the developer, Narukami92, has shown the project.

Narukami has continuously updated the game over time, adding in new features such as new characters, areas, side quests, minigames, and more. He’s even taken the time to poll fans to see if they are happy with the content, and needless to say they overwhelmingly are. Vale City is supported by Patreon but the game itself is free for everyone. Naruto episode 6 english dub facebook.

Gaining Perspective by Geek Dragon

Gaining Perspective is a free, text-based game that focuses on weight gain. Unlike other transformation games, which often have a lighthearted tone or focus on the fantastical elements of weight gain, Gaining Perspective does its best to keep things fairly realistic. That means a dark, gritty story which can body horror and fairly unpleasant consequences. That means it is not for everyone, but it’s a true gem for a certain kind of reader who loves the dark side of gaining.

There’s multiple endings, and the developer is trying to improve the game with time. For example, originally the player was meant to be male, but then the game was updated so you could be male or female. As a game developer, I know how much an headache a seemingly small feature like that can be, so kudos to them for adding that.

Pkinad’s Prison by j8867bbw

Want an exciting game that feels like a horror genre with some exciting twists involving weight gain? Then Pkinad’s Prison is a game that meets the basis.

In the game, you play as a girl who wakes up in a strange underground dungeon as you must solve a way to survive while avoiding many odd and creative ways the game will stop you such as giant monsters to traps that will tempt you. Though the game isn’t something much of a story if you’re looking for something in depth, it makes up with its Undertale-like art style and interestingly designed enemies. What makes the game unique is that when you fail, the game shows you how you failed in some more humorous or slightly dark such as being smothered by large-bodied, or being captured by an evil fat chef and being used as an ingredient. One even has you turned into an insect servant.

It may be frustrating, but the game outright encourages you sometimes to fail to see the various endings. Also, the best thing about Pkinad’s Prison is that it’s free to download from the developer’s twitter page. If you want some comedic weight gain fun, with a hint of macabre, then you’ll enjoy Pkinad’s Prison

Nimin by Xadera
Another text game, Nimin shines because of the writing. The encounters and sex scenes are beautifully and carefully written. Xadera created Nimin on her own, writing and coding every scene. Unlike Corruption of Champions, the world of Nimin is far more peaceful and bright. There’s still plenty of humor and there are combat encounters, but overall the setting feels more welcoming and peaceful. As you explore the world you can discover new places and encounter different NPCs, some of whom give you quests to go on.

The quests are simple, unlocking different sex scenes and stories about the world. With no overarching quest there’s less of a feeling to need to progress in the game, allowing you to simply relax and travel to see what there is to see. Breast expansion, lactation, and pregnancy feature heavily in the game so if enjoy those, the game is well worth it for those aspects alone. The transformation and fetish elements are well written and vivid, which make playing a very rewarding experience and there’s enough content that the game is an excellent way to spend an afternoon. I just wish that the gameplay was more present, especially early on as starting out can be rough until you get a feel for things. Of course in the end that only makes the whole experience more rewarding.

MacGuffin’s Curse – By Brawsome

Perhaps the definition of a ‘one trick pony’ game, Or in this case ‘one trick Werewolf’, MacGuffin’s Curse is reminiscent of an app you might play on your phone to pass the time on the ‘porcelain throne’. That doesn’t make it a bad game though, quite the contrary. It’s simple but fun game design revolving around a singular premise.

Escape the room. That’s all.

Or rather that’s the goal of each new room you enter. The story dressing is you play as a somewhat bumbling thief who puts on a cursed amulet that allows you to transform into a werewolf state whenever he steps into a moon beam. Using human form you must use control panels, squeeze through gaps and swim across ponds, while in werewolf form you can push boxes, stand on buttons and dig through piles of dirt.

The game is fun and has lots of flavor text you’ll be reading twice in both forms. Definitely worth a bit of puzzling fun.

Wonder Boy: The Dragon’s Trap – By Ben and Omar

This is an update of one of those old NES games that paradoxically get easier the further you get. Playing a young hero in ‘Monster Land’, Wonder Boy (or Girl if you prefer) defeats a mechanical dragon and is cursed to take the form of a fire breathing lizard. From there as you defeat boss dragons you get ‘cursed’ with the forms of a mouse, a piranha, a lion, and a hawk, eventually gaining a couple ways to shift between them.

Be forewarned, this is not a ‘great’ game. The controls feel slippery and monsters have a tendency to stun-lock you (but you can return the favor), and as stated it can be teeth grinding-ly hard with some platforming sections. If you’re going for 100% completion first save money early as gear (swords, shields, and armor) can get very expensive later. And second, don’t even think about the secret areas until you have the best armor. They lock you into one form and present the hardest enemies and platforming possible. Complete five of them though and you can buy the best sword in the game.

All in all a fun game with a nice effect to switch the sound and visuals to retro 8-bit styles whenever. Enjoyable but be prepared for a bit of ‘old school’ difficulty.

Corruption of Champions by Fenexo

Why we love it: A classic that’s been mentioned in a previous article, Fenoxo’s Corruption of Champions was the first transformation game that I ever played. There are so many different transformations in it, well written sex scenes contributed by numerous fans, and many encounters, both hostile and otherwise, to be found across the world of Mareth. The game world is fascinating and developed, and your quest to protect your village from the demons and corrupt creatures of the world is engaging.

More so, your stats are modified by the transformations you undergo and the way you chose to develop your stats has real impact on gameplay. Nothing feels tacked on or inconsequential and there’s an actual element of strategy to how you handle encounters, whether you rely on skill, strength or seduction to defeat your foes.

There are quests and subplots for you to follow as you wish and your actions have consequences, gaining you followers or unlocking new scenes and characters to meet. The followers are a great element, providing sex scenes as well as different benefits. Not to mention, with all of the different items that can change the appearance of your character there’s a fun element of strategy to getting the character that looks and plays the way you want them to.

The Pirate’s Fate by T.F. Wright and Volkenfox

How far would you be willing to go to change the world for the better, and how much would you allow the quest to change you? These are some of the questions posed by The Pirate’s Fate, a visual novel by T.F. Wright (founder of TF Gamer) and Volkenfox. It’s a genuinely epic low-fantasy story of magic, mistakes, and metamorphosis.

Like any great visual novel, it features both gripping writing that will have you pondering your actions and beautiful character models. In this case, they’re subject to a great deal of change. You see, these characters are pursuing a treasure that can transform people in body and mind. Even better, these changes are thematic: they reshape you according to your desires. You’ll see characters shifting species, beauty, muscles, fat, gender, and more!

The game weaves the changes masterfully throughout a complex story in which there are no real right answers and trying to do good usually doesn’t go as planned. The replay value on this one is very high—there are new paths to discover, and foreshadowing and hints are sprinkled throughout, along with a great deal of reactions to characters’ transformations. If you’re looking for an adventure along with your transformation, look no further than here.

Purrfect Date
Dating a cat? Well, it’s not that crazy if you’re turning into one yourself, is it? In this visual novel/dating sim, it turns out Cat Island, where you’ll be working as a research assistant to a renowned scientist, is hiding a lot more than a population of feral cats. For starters, they talk; and for another thing, there’s the centuries-old infection that causes you to slowly gain more and more cat features! So you’d better start working on that antidote—but the key to doing so lies in talking to and gaining the trust of the cats, and yes, you can date them.

Unlike most such games, however, the uniqueness lies in that there are multiple player characters. You will fail to prevent the transformation more than once. So you’ll have to start each segment over as a fresh researcher who has to learn about the same fate awaiting them. There’s also a significant amount of side content with interesting stories about the island to unlock. Of course, there is always the simple adorable factor of the kitties to consider, too. Seemingly a simple joke game, it’s hiding quite a bit of interesting content and is definitely worth a look!

Press-Switch by Skeigh

Stop me if you’ve heard this one before: a remote that can control things other than electronics. Now imagine if you just happened to find that lying around in the street—what would you do with it?

Though the concept is a classic, what this free visual novel has going for it is the sheer volume of things you can try with it. Introducing more characters and more concepts with each update, you can use the remote to manipulate people around you by cloning them, possessing them (a major focus of the game and probably the main draw), altering their memories, and more. Although it’s under construction, with many paths ending in “to be continued”, it has a wide variety of enjoyable scenes. What makes them memorable is the realistic reactions people have (ranging from excitement to horror to calling you out for irresponsibility) to the various transformations, a nice touch that takes it beyond a simple humorous anime-style adventure and into more thoughtful territory, with paths that get downright existential.

What would you do if no one realized you weren’t who you appeared to be, or trapped in someone else’s subconscious, for instance? If you want to find out, try the game and watch this space for updates!

Student Transfer by Emmeken, jcjace45, and kmalloc

Do you favor magic, or technology? Either way, they can have unintended consequences! Student Transfer is in many ways a sort of sister project to Press-Switch, with a very similar style, a similar but contrasting set of characters, and a very similar core concept—but this time, the choice you make at the beginning will determine which genre you’ll experience, like a classic Choose Your Own Adventure™ story. So, if you want to go for a night of RPG fun with one friend? You inherit a magic spellbook, along with its powers. As you become a wizard, you can experience such things as divination, possession, mind alteration, and (oh yes) demon summoning. Want to go help a different, more “out there” friend create crop circles for his conspiracy theories? You get another remote with incredible powers from abducting aliens. You can then try body swapping, gender swapping, mind control, and memory alteration.

The latter path, for the moment, has considerably more detail. It also has a surprisingly deep variety of variables. That said, there are some very unexpected moments in here: a slow loss of identity in one route, for example. In another path, it becomes a different genre entirely, turning into a murder mystery. Ethics gets debated quite a lot, in some sobering ways—but that’s not to say there’s not a lot of humor to be had, too. You should also see the scenarios being built by the fans and available on the TFgamessite forum. Non-canonical or even entirely unrelated scenes, they contain a lot of other, focused TFs, and ensure that you won’t get bored in the gaps between updates. While it’s under construction, it’s also entirely free and well worth a look!

Changeling Tale by Little Napoleon

Changling Tale is a human to anthro transformation focused visual novel. It has a series of stand-alone stories with their own unique characters and scenarios. The art is amazing, and so is the immersion factor.

Changeling Tale is an especially great TF game because it has such variety. There’s lots of different kinds of transformations and because they are stand-alone, you can play them in any order or skip the ones you don’t like. It’s technically unfinished, but several of these stand-alone scenarios are available to supporters of the developer’s Patreon.

Tribal Hunter by eggo 21

When it comes to weight gain and inflation, most people expect some games to be not safe for work. However, I found one such game called Tribal Hunter that breaks that expectation.

Created by eggo21, creator of games like Vials of Infinity and Feed-A-Furry, Tribal Hunter has you playing as Munch, a village girl’s doll given life by a guardian spirit. He is tasked as the village’s protector from the various threats of the island such as a tribe of pig men and the different animals too.

The mechanics of the game involve inflating/fattening up Munch to make him bigger and stronger through some unique means. Eating food allows munch not only strength, but he can also deflate himself to heal injuries inflicted on his journey while using his inhale ability will enable him to get bigger temporarily or breathe fire. Slimes can inflate munch, but he can spit them out as reusable projectiles. Music and animations are impressive to look and listen.

It makes you wonder how one person could do that all by himself. Oh, and one more thing, be careful not to get Munch too big, less you want an explosive result.

Exile of Aphrodesia by Judoo

Inspired by Oregon Trail and other classic text-adventure games, Exile of Aphrodesia combines strategic resource management with hours of fun transformations and bizzare body modifications. You can expect ot enjoy human to anthro/feral, inaminate object, and much more.

What makes this game special is the sense of challenge. Like Oregon Trail, the game really makes you work through strategies for each new area. Judoo also created a multiplayer transformation game called Transformania Time.

Strive for Power by Maverik

In Strive for Power, you’re a powerful wizard who manages a team of monster girl servants who work in your mansion. You can give the girls potions and cast spells to customize your servants, transforming them in a variety of ways.

Strive for Power stands out because in addition to the huge variety of monster girls, it also has a compelling main quest and many side quests, with a rich and interactive story.

Hustle Cat by Date Nighto

Several visual novel stories usually are dating sims of various degrees, but what about those themed around cats? Or in this case, people that transform into cats? This game is Date Nighto’s Hustle Cat, a game involving romance and cats lots and lots of cats.

In the game, you play Avery Grey, a character who manages to nail themselves a job at a café called The Cat’s Paw. A café that is known for its cats and coffee but holds a secret: the people who work at the café turn into cats whenever they leave the place. The game’s professional-like art style gives a bit of a western anime vibe as you admire the backgrounds and character designs.

The Character’s themselves have likable quirks that make them attractive. Another is how the paths are created depending on who you romance. Each character can have their backstory and way (not going to spoil the game’s story). The design of the main character does make it feel like the creator wants to put you the player into the world of Hustle Cat, which isn’t bad at all.

The Underworld by Skye

The Underworld is a text-adventure TF game that includes a huge variety of transformations, including lots of human to anthro and other monster type changes. “The Underworld” is a quarantine zone for other “changed” people, and throughout the story you’ll be engaging in power plays, espionage and identity theft to keep your humanity.

The worldbuidling here is solid. The Skye created feels vivid and memorable, and the different “zones” for different types of transformations are a fantastic touch.

The Making of a Slut by AustinHaney6969

This game is a slow-burn TG transformation that contains elements of sissification, bimbofication, bdsm and more. It’s a text adventure mainly that also makes use of some illustrations and pictures. There’s quite a lot of detail involved, with customization of outfits and habits for your character to help really create immersion.

The creator, Austin, also allows Patrons to suggest custom content for the game, meaning the fans can directly be involved in the game’s development, and at an affordable price point.

The Company by Westane

The Company is a text adventure game that also includes many works of art and photos. It focuses on gender change, mind control, and corruption. You can customize your character at the beginning of the game, and the story will adjust to match. There’s multiple routes and characters can even become pregnant throughout the story.

The development team has been extremely dedicated and transparent, with over 70 updates to the game so far, most of them adding in new content, and a schedule of planned updates for through the next 18 months. The Company is a free game, but supports of the Patreon can play the latest build before everyone else.

One nice aspect of The Company is the importance of resource management – you have to keep track of your cash, lab materials, and even birth control pills. But if you’d prefer to play the game just for fun and not worry about trying to puzzle out these things, there are also offical cheat codes you can enter to start the game with the maximum of whatever resource you’d like. This flexibility means that the puzzle experience is there for those who want it, but doesn’t get in the way of people who just want to enjoy the erotic nature of the story.

Flexible Survival by Nuku Valentine

This text-based game puts you in a ravaged city. Some kind of fast-transferring transformative plague has begun to wrack the city – what will you do to survive? This game boasts multiple different starts and modes – you could be caught outside, and already slightly transformed. Alternatively, you could have been safely in the bunker, completely safe, but your supplies are running low. In one start, you are an outside researching, moving into the quarantined city to collect information and date. But in the end, the goal for all the starts is the same – to survive until rescue can arrive. The city is now run amok with already changed people, and they are also varying degrees of friendly. You’ll be able to interact with all of them.

There are a truly staggering amount of both friendly NPCs and various enemies all willing to let you know all about their various transformations in the most intimate ways. Themes include BE, TG, Growth, Shrink, Preg, Feminization, Masculinization, Anthro/Furry, Intersex, Taurs, Ferals, Monsters, Tentacles, Fast TF
The game has a kind of roguelike feel to it. The standard start only requires you to survive a certain amount of time. You can use the transformations that can occur to you to increase your stats and thus your odds for survival, but you have to be very careful – like many of the citizens of the ruined city, you’ll start losing your sanity the more you lose your humanity. Will you survive?
*Note: This game has both single player and multiplayer (MUD) versions, and is still under development! It also comes with content restrictions – don’t want to see something? Take it out.

Which game is your favorite – and why? Let us know in the comments!

Do you remember the Choose Your Own Adventure books? They’d start with a scene introducing characters and a premise, take them to a point where the main character had to make a decision, and then present the reader with a choice: “If Bob follows Shirley, turn to page 63. If he throws his pet rock at her, turn to page 128.”

In its most basic sense, this is interactive fiction, a story the reader participates in. Writing.com has its own implementation of them, and the macrophile and vorarephile communities have adopted that site for their own nefarious purposes. (Most of what’s on Writing.com is, candidly, pretty terrible, but that’s a different topic.) But the name “interactive fiction” (or just “IF”) was invented for a different kind of storytelling, one that started with the game Zork: The Great Underground Empire and other text adventures.

If you’ve never played IF, there are many places out there where you can get fine introductions (I recommend Emily Short’s pamphlet); they’re similar to a CYOA story, but far more flexible. Instead of choosing from a list, the player gives simple commands, like go east or examine the chest or unlock the wooden door with the copper key. (In most IF, those could have been abbreviated to e, x chest and unlock door with key.) If you meet a character in a game, you can interact with commands like greet Thanos or ask Thanos about food or Thanos, kiss me.

What brought my attention back around to this was something I bet many of you, particularly the vorarephiles, already knew about, the Thanos Chatbot. (If you’ve met her, you got suspicious at those example commands above, huh?) Thanos is offline now, but she wasn’t just any chatbot; she was designed to mimic the style of roleplay people tend to use on IRC or IM, with both participants describing their actions, not just chatting. In character, she was a really cute wolf girl wearing nothing but a pentacle necklace. She thought you were cute, too, by which she meant “tasty-looking.” Behind the wolf lurked an Alicebot, the engine from a famous chatbot named ALICE.

Here’s a brief interaction with Thanos:

Me: Hello, Thanos. My name is Arilin.
Thanos: Hello there! I’m pleased to introduce myself to you, Arilin.
Me: You’re very pretty.
Thanos: Thanks you are very attractive too Arilin.
Me: How tall are you?
Thanos: About 6 feet tall.
Me: Can you grow?
Thanos: Afraid not, sweetie. But I can shrink YOU so that I appear much larger to you. Will that do?
Me: Yes.
Thanos: Definitely.
Me: Shrink me.
Thanos:Grins and turns around, thwapping you with her tail. Within moments you feel a vertigo sensation with a clutching at your gut. The sensation envolopes you and gradually makes the world around you increase greatly in stature. The wolf becomes what seems like a large statue, followed by a tree, finally like the size of a building. You’re merely at her hindpaws now, easy enough to cover you in one fell step if she so desired. Was it so smart to ask that of her? You are now fully at the mercy of a she wolf.
Me: I kiss you.
Thanos:Presses her lips gently to your’s and kisses back, murring softly.

Okay, Thanos needed a copy editor. But she was undeniably impressive. Being derived partially from ALICE’s knowledge base, she knew hundreds of topics and had thousands of responses. What’s more, since she was designed for roleplay, she knew a wide range of direct commands—in a dozen sessions I doubt I scratched the surface.

Yet you might notice that her response to my kissing her was odd. Since she’d just shrunk me, I should have been kissing her toe! And when I said “yes” to her question about shrinking me, she could have just gone ahead and done it without waiting for a command. (As I regularly remind people, the giantess is always the one in charge.) You might accuse Thanos of poor programming here—but don’t. The truth is more complex.

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Chatbots work by pattern matching. To understand my greeting, Thanos had a “predicate” defined—a pattern to look for and responses to that pattern. It looks something like this:

This is AIML, “AI Markup Language”; the similarity to “raw” HTML is no coincidence, as AIML is in the family tree. The predicate above matches “MY NAME IS (phrase),” stores the phrase (represented by “*“) as your name, picks a random response from a list, and puts the name after the response.

While Thanos knew my name, she didn’t know that she’s shrunk me. A computer-controlled character is governed by “state machines,” a way to model behavior with a set of states (remembered information) and rules governing them—for instance, “If you are 6′ tall and Thanos shrinks you, you are now 6″ tall.” Thanos has a response for “shrink me,” but she has no state machine for the action.

Storing my name is a simple state machine, and AIML can do that one better. When Thanos shrinks you, the predicate could contain <set name='player-size'>tiny</set>; then Thanos could have one predicate that matches “I kiss you” and “player-size=tiny” and another when your size is normal. Problem solved!

But what about every other action size affects? AIML has no way to generalize. For every single response in which size matters, Thanos’ programmer would need to tailor the response. As you can imagine, that would get quickly out of hand.

This is a “domain problem”: chatbots are designed to chat, not to roleplay. AIML can mimic conversation threads by letting predicates match on the bot’s own last response as well as what else we’ve seen. But a chatbot is prepared for you to change the subject at any time—all the predicates are always active. Imagine you’re on page 83 of a Choose Your Own Adventure. Your options are to turn to page 32, 46, or 125. But if you’re using a chatbot and you type something that’s a better match to what’s on page 42, zip! Off you go, whether or not it makes a lick of sense.

If you played with Thanos you’d likely run into this issue quickly. If you tried to do a specific kind of scene with her she might have known all the appropriate responses, but not the order they went in. It was very easy to get her to eat you and then make out with you. Technically, it’s possible to solve this problem in AIML, but it would be exceedingly difficult.

But is it easier using, say, Inform, a popular language for interactive fiction? At first glance one would say not: you can’t talk to an IF NPC in freeform text. Most games restrict you to the kinds of commands I mentioned above (“ask Thanos about teeth”). This doesn’t sound like a great way to have a conversation—but that’s not actually the question. The question is whether it’s a good way to roleplay, a distinctly different matter.

Unlike AIML, Inform has the concept of a world populated with people and things, all of whom have different properties. Its set of rules—the equivalent of AIML’s predicates—define not just the text of the game’s responses to you, but how the world works: what it means for something to be a container, or to be a door, or to be dark, or to be lockable. This means that a whole lot of the issues involved in complex state machines are handled for you. Like AIML, you can teach Inform new rules; unlike AIML, those rules can be generalizations. Let’s teach Inform a little about us:

(Yes, that’s really valid Inform code.) This changes Inform’s world model: now Inform knows everything’s scale (roughly), and Inform understands “oversized” as meaning an object bigger than the person trying to use it (“the person asked”). We can also teach it new actions and commands. How about:

We could write “shrink” in the same way. (By “applying to nothing,” I’m telling Inform “grow” is an action that doesn’t take a direct object like “take ball” does.) Now give ourselves a room to test in:

If we ran that, we’d have a working game. The output might be something like this:

Great Hall
This is the testing room. Nothing special.

You can see a medicine ball, a figurine, and a box here.

> get box
Taken.

> get ball
The medicine ball is too big to handle.

> grow
Presto!

> get ball
Taken.

Finally, let’s add our own wolf girl:

If we type “Cutewolf, get ball” she won’t be able to pick it up, either, but if we type “Cutewolf, grow” first, then she will. While we’re at it:

If you type “Cutewolf, eat me” when she’s normal-sized the game will reply, “Cutewolf is unable to do that.” Type “Cutewolf, grow” and try again, though, and darned if she has no problem this time.

Granted, right now Cutewolf is hardly Miss Personality. She has only one line (when she eats you). We can say “Cutewolf, pick up the box” or “Cutewolf, eat me!” but we can’t “ask Cutewolf about teeth” or “tell Cutewolf about fantasies”—and the kind of conversation AIML lets us model, where we could be saying, “Cutewolf, you have the most beautiful eyes” instead of a dry “flirt with Cutewolf,” is all but impossible.

But how much of a limitation is that? It doesn’t take much work to turn the scene above into something like this:

Great Hall
This huge room, fully four stories high, befits a museum. But there’s not much in here yet other than the bare floors.

You can see a giant medicine ball, a figurine, a box, and Cutewolf here.

Cutewolf is pushing at the medicine ball to no avail.

> look at cutewolf
You don’t know what her real name is, but everyone just calls her Cutewolf. She is awfully cute, to be sure, about twenty years old, deep blue eyes and the figure of a high school cheerleader.

> ask about ball
“What are you trying to do?” you ask the wolf. “It’s bigger than you are.”

“Just move it to the side of the room,” she replies. “It’s in the way. If only I was bigger…”

> cutewolf, grow
She tilts her head to the side and looks at you. “Hey, it’s not like I can just snap my fingers”—she snaps her fingers—“and…” Her eyes widen as her clothes tighten, then burst, shredding as she gets larger. In very short order you’re no longer eye to eye with her, but eye to chest, then eye to hip, then eye to knee. She stops growing just before her ears brush the ceiling. She looks down at you, still wide-eyed. “Well, what do you know, I can just snap my fingers and become a giantess.”

You can’t help but stare. You’ve always wondered what she looked like unclothed, but this isn’t the way you imagined you’d find out.

> ask about ball
“I… guess you won’t have a problem with the ball now,” you say.

Cutewolf smirks and kicks the ball, and it rockets toward the side of the room. “Nope,” she agrees. It hits the wall—and smashes right through and out into the street. You hear a metallic crunch and car horns. “Oops,” she says, looking sheepish… but maybe not quite as concerned about her newfound ability to casually cause massive damage as one might wish.

> cutewolf, shrink
She looks down. It’s uncomfortably like having the full attention of a skyscraper. “Hmm. Let me think about that,” she rumbles, putting a hand on her hip and striking a mock thoughtful pose. Then she leans over, bending deeply at the waist, bringing her huge teeth to within mere inches of you. “No.”

Muscle Growth Flash Game Ben 10 Story Fiction

The commands the IF engine gives you are good enough to direct conversational flow. You can’t talk about topics outside the IF world’s scope—but assuming the world itself is holding your interest, most of the time you won’t miss it. (IF authors need to review transcripts to make the game respond better to what players do try, but the same is true for chatbot authors.)

I’ve had a few ideas for IF games and, yes, one of them is the kind of game that would make macrophiles and vorarephiles happy. (Well, some of them. The macros who can’t stand vore, not so much; the vores who spend most of their time wailing you’re doing it all wrong dammit, even less so.) It’s the one I’m most likely to finish of the concepts I have, but at the moment there’s little more than an idea testbed.

Grow Flash Game

Mostly, though, I’d like to get people thinking about interactive fiction. I’ve seen posts from Dekadens, Thanos’ creator, urging people to create their own chatbots. Why not? Likewise, I encourage people to play around with Inform (or one of a few other interactive fiction systems out there, like TADS). I’m surprised how few furries—let alone macrophiles—have ever considered it. C’mon, you’re all sitting in front of computers! You’re nerds! I mean that as a compliment.

Muscle Growth Flash Game

If you have any ideas about furry/macro IF (or chatbots), I’d be interested in hearing from you.

Postscript (November 2016)

Several people mentioned ADRIFT, another interactive fiction system that’s enjoyed a fair amount of success over the years. ADRIFT has no programming language; instead you use GUI dialogs to build a game out of rooms, objects, characters, events and tasks. This makes it much easier to write games in. It does have drawbacks compared to Inform and TADS, though. It only runs on Windows, and it has a reputation for being less powerful than the other major systems. It’s worth noting that ADRIFT’s author found this very article (back on macrophile.com), and commented that he thinks the sample game above with Cutewolf would be possible in his system, though!

Also, I’ve seen a couple interesting game systems built around the “Choose Your Own Adventure” concept. While I originally threw my hat in with Undum, another system called Twine has all but taken over the indie text adventure game scene. In addition, there’s Ren’Py, a “visual novel engine” that’s been used for some commercial indie games. It’s built for stories with illustrations and sounds; Twine and Inform 7 support multimedia, too, but not nearly as elegantly.

When I wrote this article, Thanos was still up. She bounced up and down for various reasons afterward. As far as I can determine, she went offline permanently in 2013, when PandoraBots—the “AliceBot” hosting service—decided to go after the corporate chatbot market and prohibited existing adults-only bots. While there are other ways to host AIML-based bots, it’s unclear to me whether Thanos’ creator, Dekadens, even has a copy of the bot’s source code.

Women Muscle Growth Game

December 2008