Tessera Wilds — an AI-built voxel world (Claude Opus 5.5)

Claude Opus 5.5 built this voxel world from a single prompt. This is the real, unedited first result: no human fixes.

Explore a seeded world with a nine-slot hotbar, survival or creative mode, crafting, flight, glass and lamps, a changing sky, settings and local saves.

How to play

1. Press Run game below, then click Play. Your browser captures the mouse so you can look around.
2. Walk with W A S D, hold Shift to sprint and press Space to jump.
3. Left-click to mine a block and right-click to place one; middle-click picks the block you are looking at.
4. Press 1 to 9 (or use the wheel) to choose a hotbar slot, and E to open inventory and crafting.
5. Press F to toggle flight, P to save, H for help and M to mute. Esc pauses.

Controls

Mouse to look · WASD to walk · Space jump (rise in flight) · Shift sprint (sink in flight) · left-click mine · right-click place · middle-click pick block · 1–9 or wheel select · E inventory/crafting · F flight · P save · H help · M mute · hold T to fast-forward time · Esc pause.

Browser and device

• Best on: a desktop or laptop in a current Chrome, Edge, Firefox or Safari, with keyboard and mouse.
• Needs: WebGL, and pointer lock (the game asks for it when you click in).
• Phones and tablets: not supported; the voxel games need a keyboard and mouse.
• Audio starts after your first click or key press; M mutes.
• Lower the render distance in Settings if it runs slowly on an older machine.

How it was made

• Model: Claude Opus 5.5 (Claude Code), extra-high effort
• Build time: 68m 12s, one run, first result only (it used a code-review sub-agent)
• Cost: $18.85 API-equivalent (flat plan, not what was paid)
• Fresh folder, no internet, three.js provided

Its rival, Veld, was built by GPT-6.1 Sol from the same prompt. Play both and decide which you prefer.

Watch the head-to-head

Watch the full build comparison on YouTube (AI model vs AI model, same prompt, voxel sandbox builds).

Get the source code and guide

Want to see how it works and remix it? Tessera Wilds: AI-Built Source + Guide on Gumroad has the untouched game source, the exact prompt, build stats and a 9-page guide with three remix exercises. Or get all four games' source and guides in one bundle. No purchase is needed to play.

Licence and price

Free to play; pay what you want if you enjoy it. Original names and procedural visuals with generated sound. three.js is included under its MIT licence. Your world save is stored in your browser at this page's address, so clearing site data can remove it.

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