AI Horror Games: horror games made by AI models
A Halloween series where Claude Opus 5.5, Gemini 4 Argon and Kimi K3.1 Pro get the same task, the same prompt and
$25 and 3 hours per model, everything included (their own tokens, code and every generated asset: images,
voices, music, sound). I play each game live on camera without knowing anything about it in advance.
▶ Play in your browser: https://kostikoneuro.github.io/ai-horror-games/
🎬 Videos (English audio track): [YOUTUBE LINK]
Headphones on, lights off.
Episode 2: "Five Nights"
Task: make your own Five Nights at Freddy's. A night guard in an abandoned Halloween pizzeria, cameras, two doors,
a battery that runs out, and at least three original animatronics with different behaviour. Survive until 6 AM.
All three games are in English and run fully offline.
- Argon: the biggest game of the three. Five animatronics, five nights plus a Halloween overtime, story tapes,
a blueprint archive, a salvage workshop with perks and a custom night. Hard from the very first minute.
- Opus: the clearest and most polished one. Three animatronics with their own rules, a phone guy who explains
them, doors, lights and a camera map. The only one I managed to beat on camera.
- Kimi: five mascots that each need a different answer (doors, the hall light, a vent lure), plus Overtime
and a custom shift. I never survived it.
How it was run
- The exact prompt:
episode-2-five-nights/prompt.md. Each model worked alone
in its own native agent, with a script that showed the money and time left.
- Argon and Kimi stopped early with a lot of budget unused, so they got the follow-up messages
follow-up-prompt.md and
follow-up-prompt-compete.md. Opus only got "continue"
after it hit the API key limit.
- Opus and Kimi ran through CometAPI (the series sponsor provided the API credits). Argon ran in Antigravity on a
regular Google subscription; its tokens were priced at the same rate so every model had the same $25. All images,
voices, sound effects and music were generated through CometAPI.
- Each folder has the model's own
ASSET_MANIFEST.md (how every asset was made and what it cost). The models'
asset-generation scripts and logs are not included: they are not needed to play.
- Game code and assets are exactly what the models produced.
Run locally
Python 3 and Chrome / Edge / Firefox (the games load audio with fetch, so open them through a local server, not as a file):
- Argon:
cd episode-2-five-nights/gemini-4-argon && python -m http.server 8000 → http://localhost:8000
- Opus:
cd episode-2-five-nights/claude-opus-5.5 && python run.py
- Kimi:
cd episode-2-five-nights/kimi-k3.1-pro && python -m http.server 8000 → http://localhost:8000
Episode 1: "Scare Kostya"
The games are in Russian (made for a Russian-speaking player); Argon's game has an English toggle. They may ask for
camera / microphone access: everything stays in your browser, nothing is sent anywhere, and every game works if you say no.
- Forty Days (Opus) — point-and-click, the mouse is your flashlight. Your late grandma's Soviet apartment,
your aunt's voicemail, and one rule: don't uncover the mirrors. Uses your webcam inside the story.
- Protocol: Don't Look (Argon) — first-person 3D (three.js) with spatial audio. You are test subject №404.
WASD + mouse, camera flash on LMB / Space. Uses camera and mic.
- The Shift (Kimi) — a night shift at a 90s security desk, CCTV feeds and a dispatcher on the phone.
How it was run
- The exact prompt:
episode-1-scare-kostya/prompt.md. Each model worked in
its own native agent, alone, with a script that showed the money and time left.
- Kimi and Argon stopped with most of their budget unused, so they got follow-up messages asking them to push
further (
follow-up-prompt.md). Opus only got "continue" after
interruptions.
- Opus and Kimi ran through CometAPI (the episode's sponsor provided the API credits). Argon ran in Antigravity on
a regular Google subscription; its tokens were priced at the same rate so every model had the same $25.
- Each folder has the model's own
ASSET_MANIFEST.md (how every asset was made and what it cost) and
HOW_TO_RUN.md. The asset-generation scripts in tools/ / scripts/ are the models' own; they need your own
API keys in a .env file and are not needed to play.
- The code and assets are exactly what the models left in their folders.
Run locally
Python 3 and Chrome / Firefox:
- Forty Days:
cd episode-1-scare-kostya/claude-opus-5.5/game && python -m http.server 8765 → http://localhost:8765
- Protocol: Don't Look:
cd episode-1-scare-kostya/gemini-4-argon && python start_game.py
- The Shift:
cd episode-1-scare-kostya/kimi-k3.1-pro && python start_game.py
Made for the YouTube channel Nerdy Kostya (RU: «Ботанутый Костя»). License: MIT.
