New: Claude Fable 5.2 games from launch week

Play them
Tiny AI Games

Puzzle · shared October 2026

Tree Appreciator: an AI game made with Opus 5.5

A slow spot-the-difference game: two trees from one seed.

Opus 5.5PuzzleCozy

Loads from the creator’s site when you press play.Open in a new tab ↗

About Tree Appreciator

Two trees grow from the same seed and you look for the small ways they differ. It is a single HTML file of about 260 KB, made in one go with Claude Opus 5.5, and the prompt is public on the creator’s blog.

How Tree Appreciator was made

Simon Willison credits Claude Opus 5.5 in the post, page or repository where the game was shared. We copied that credit; we did not rebuild the game.

Follow Simon Willison for updates, or see every game by Simon Willison on this site.

More AI games made with Claude Opus 5.5

Skywake, AI-made browser game, title screenOpens on CrayonSkywakeA flying adventure from a Gemini hackathon, built with Argon and Opus.Gemini 4 ArgonOpus 5.5FlyingHiraeth, AI-made browser game, title screenPlays hereHiraethAn ink-drawn exploration game across deserts and sunken cities.Opus 5.5GPT-6 AstraRPG & adventureArcadeEvent Horizon: Eat the CityOpens on ThinkletEvent Horizon: Eat the CitySteer a black hole and swallow the city, block by block.Opus 5.5ArcadeBattle Drones, AI-made browser game, title screenPlays hereBattle DronesA phone-friendly real-time strategy game with multiplayer.Opus 5.5StrategyPhone

All Claude Opus 5.5 games →

More AI puzzle games

The Quiet Elevation, AI-made browser game, title screenPlays hereThe Quiet ElevationA watercolour climbing puzzle about a mother looking for her son.Gemini 4 CarbonPuzzleYarn Planet, AI-made browser game, title screenOpens on ynot.gamesYarn PlanetWalk around a tiny planet; your path becomes a coloured thread.Opus 5.5CozyTable Tilter, AI-made browser game, title screenPlays hereTable TilterTilt the table to roll a ball, a D20 or a teapot into the hole. 100 levels.Model not statedArcadePhoneNumCube, AI-made browser game, title screenOpens on letsrework.comNumCubeRectangle-splitting logic puzzles rebuilt in 3D.Gemini 4 ArgonPuzzle

All AI puzzle games →

Tree Appreciator FAQ

Is Tree Appreciator free to play?

Yes. Tree Appreciator is free and runs in a web browser with no download or sign-up. You can play it on this page or open it on the creator’s site.

Which AI model made Tree Appreciator?

Claude Opus 5.5, according to Simon Willison. The credit comes from the creator’s own post, page or repository.

Can I play Tree Appreciator on a phone?

Yes, it was made for phones and touch screens.