The Proteus Effect

The Proteus Effect is a game for adults that combines lighthearted comedy, engaging characters and story, lively dialogue, and gripping challenges with distinctive, vivid art and alluring erotic scenes to create a fun, sexy, and ultimately unique experience.

You take on the role of Alex, a lovable but dimwitted young man who barely graduated college and is now desperately searching for a job. Just in the nick of time, he stumbles into the job of his dreams as a video game tester for a virtual reality startup, but all isn’t as it seems. After being introduced to his eccentric coworkers, he soon finds himself not only trapped in the virtual world, but also stuck in the body of a nubile young woman.

All Alex wants is to return home to his own body, but he winds up reluctantly embarking on an adventure through a series of fantasy worlds, including the company’s game world, another world that’s suspiciously similar to a popular MMO, and an assortment of others.

He isn’t alone, though – shortly into the journey he is joined by his co-worker Ana, a tough, slightly abrasive, yet kindhearted young woman. Alex isn’t the only one who’s changed in the virtual world; it looks like Ana ended up with a little something… extra?

Eventually, Alex is joined by other quirky companions, and together they try to uncover what’s behind the system’s strange malfunctions. How does he keep getting sent to these bizarre places? What connects them all? Can he ever manage to find his way back home?

This is a game for adults, so there’s plenty of erotic content. This isn’t just mindless porn, however – the scenes are sometimes titillatingly erotic, sometimes hilarious, but always interesting and fun. The game currently has content for futanari fans, and there will be plenty of scenes for people who like ‘group activities’, monsters, tentacles, vanilla (gasp!), and many other fetishes. The erotic scenes are completely optional – you can avoid any scenes you don’t like, and if you just want to experience the game’s entertainment without any of the porn, you can do that too!

If you’re looking for a fun, entertaining, and sexy game with likable characters, laughs, and distinctive art, The Proteus Effect might just be your game. So go ahead, give the public version a try! It’s only one major release behind the patron version, and it’s free! And if you really enjoy the game – and I think you will – please consider supporting the project by becoming a patron.

Developer: Proxxie – Patreon | Subscribestar | Itch | Discord |
Censorship: No
OS: Windows, Mac, Linux, Android
Language: English
Genre: 3DCG, Female Protagonist, Fantasy, Masturbation, Futa

Install instructions:

Just unzip and run the game!

Note for macOS users: save files are stored in your user library:

~/Library/Application Support/KADOKAWA/Proteus Effect/

All other OSes: saves are stored in the game directory’s save folder (as usual with RPG Maker games)


  • Added 4 unique arena fights
  • Added several skits, scenes, characters and conversations (mostly centered around the arena fights; some as a spectator at arena)
  • Added some arena rewards, including a way to purchase (a limited number of) consumables
  • Added enchantments and gems, two new ways to power up items, along with small gem and enchant quests
  • Revamped item screen to accommodate gems and enchants
  • A new (hopefully more pleasant) UI
  • New, much better looking icons, with distinct icons for many objects that didn’t have them before
  • More consistent design language for icons (state icons show at a glance whether it’s good or bad, abilities have one common look, easier to tell a really good item from an okay one)
  • Combat info screen, so you can find info about states and such (including whether they’re curable, etc.)
  • Removed extraneous resource bars (Ana no longer has MP, Alex no longer has TP, etc)

Download Links

Rating: 2.9/5. From 172 votes.
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