Treachery
An online haunted-house board game for 1–6 players: build the manor room by room, then find out who has turned traitor.
Official site imstealth.itch.io, verified Nov 3, 2026. The developer's own itch.io page (Stealth), linked from its official AI Browser Game Jam 5 submission page.
Where to play
Every platform this game is on. Links are checked against official sources; we never host or mirror games.
- Play free — itch.ioitch.ioReleasedFree
Plays in the browser on itch.io. No download.
Browser (no download) · Mobile · Official link verified Nov 3, 2026.
About Treachery
An online game of exploration and betrayal for one to six players, played in the browser. Together you explore a manor on a hill that is still being built: every door you open adds a room, drawn from more than 50, and the house is never laid out the same way twice. Rooms hold items, events and omens from a deck of over 100 cards, and when enough omens pile up the haunt begins and the game changes. Most nights one explorer turns traitor and gets secret orders while the heroes get theirs; sometimes the traitor's identity is known, sometimes not, and some nights it is every explorer for themselves. There are 12 explorers, each with their own strengths, weaknesses and one ability, six haunts with their own rules, and a secret errand for every explorer with a reward for finishing it. Bots fill empty seats, so it can be played with up to five friends or alone; you invite others with a link or a room code. The page gives about half an hour per session. The solo developer, Stealth, says Claude Code wrote nearly all of the code, tests, documentation, art and audio, while the developer set the vision and tone, corrected the rules, chose the art and UI direction, approved every haunt and decided the balance by playing. Free in the browser on itch.io, on desktop and phone; it was entered in AI Browser Game Jam 5.
How it was built
Partially verifiedThe AI Tools Used answer on the jam submission says the game was built by one developer working with Claude Code, and that Claude wrote nearly all of the code, tests, documentation, art and audio; the art is drawn entirely in code and the music is synthesized in the browser. The developer set the vision and tone, corrected the rules, chose the art and UI direction, approved every haunt design, picked between the art options Claude offered and decided the balance by playing. Each milestone followed the same loop: Claude wrote a plan with open questions for the developer to answer, kept the core design work for itself and handed well-defined pieces (new cards, UI components, test suites) to parallel sub-agents. Every change had to pass unit and end-to-end tests and thousands of bot-vs-bot games that flag stalled or lopsided haunts; a separate AI reviewer, not named, audited each milestone, and the developer triaged its findings and playtested on desktop and phone. Which model was used is not stated.
- DeveloperAI Browser Game Jam 5 submission, AI Tools Used: “Treachery was built by one developer working with Claude Code. Claude wrote nearly all of the code, tests, documentation, art and audio.” — itch.io (AI Browser Game Jam 5, hosted by Focaccai)
- OfficialJam rules: development must be heavily AI-assisted, with the majority of the game AI-generated. The rule is not specific to code. — itch.io (Focaccai)
A one-person project for AI Browser Game Jam 5 (theme: Torch), built milestone by milestone with Claude Code. Claude planned each milestone with open questions for the developer, wrote the core design work itself and gave well-defined pieces to parallel sub-agents; every change had to pass unit and end-to-end tests and thousands of automated bot-vs-bot games, and a separate AI reviewer audited each milestone. Later in the project, per the developer, Claude built the next haunt while the developer played the last one. The art is drawn in code and the music is synthesized in the browser. The itch.io page lists PixiJS and server-based networked multiplayer.
- Engine / framework
- PixiJS
- Languages
- JavaScript
- Team size
- 1 (solo)Developer Reporteditch.io (AI Browser Game Jam 5, hosted by Focaccai)
- Initial build time
- Not disclosed
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“Claude wrote nearly all of the code, tests, documentation, art and audio.”Verification notes: AI use from the AI Tools Used answer on the official AI Browser Game Jam 5 submission page, re-read on 5 Nov 2026; the itch.io page itself has no AI statement beyond its AI disclosure, which ticks AI Assisted, Code, Graphics, Sounds and Text. The answer says Claude wrote “nearly all” of the code and gives no percentage, so no AI code share is recorded. Team size 1 from the same answer (“one developer”). Features, player count, the half-hour session length, PixiJS, the English language field, the inputs (keyboard, mouse, smartphone) and the colour-blind-friendly label from the itch.io page; published 28 Oct 2026 (22:22 UTC) and last updated 31 Oct 2026 (22:44 UTC). Online play uses a game server for rooms; it is not generative AI. The game's code was checked for calls to AI services and none were found. Jam voting was still open on 5 Nov 2026 (it closes on 7 Nov), so no placement is recorded; the submission page showed 8 jam ratings (jam votes, not players or reviews, so not recorded as a metric). itch.io shows no public rating. The game was not played.
Development history
Published on itch.io (22:22 UTC) and submitted to AI Browser Game Jam 5 (theme: Torch), 2 days and 4 hours before the deadline.
AI Browser Game Jam 5 submissions close; voting was still in progress on 5 Nov 2026.
Officialitch.io (Focaccai)
Game performance
Each figure measures something different — concurrent players, owners, downloads and sales are never interchangeable and are never added together. Labels show where each number comes from.
itch.io
Free in the browser (HTML5) with server-based online multiplayer; keyboard, mouse or touch. Games are joined by link or room code, and bots fill empty seats.
Not publicly available: itch.io rating, Gross revenue.
Reviews & rankings
Not yet reviewed by our editors.
Not currently ranked.
Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| Treachery by Stealth itch.io | Store page | Oct 28, 2026 | Nov 3, 2026 |
| Rate Treachery for AI Browser Game Jam 5 itch.io (AI Browser Game Jam 5, hosted by Focaccai) | Official site | Not confirmed | Nov 3, 2026 |
| AI Browser Game Jam 5 itch.io (Focaccai) | Official site | Not confirmed | Nov 3, 2026 |
