Written by a model

Four games an anonymous model wrote

On 16 September 2026 OpenRouter listed stealth/union-alpha with no owner named. We asked it to build playable games. Every line of game code below came back from that endpoint, and all four run in a browser, on a phone or a desktop.

Slicer · 2D True Slice Drag a blade through a melon and the shape is really cut. The polygon splits, the pieces keep falling and can be cut again, and the total area is conserved. Play ▸ Runner · 3D Rind Runner Roll down an endless road in three dimensions, steer around the crates, take the jumps, and watch the rind crack stage by stage until it gives. Play ▸ Artillery · 2D Seed Spit An artillery duel fought with seeds, across terrain that tears open where the shot lands. Angle, power and the wind decide it. Play ▸ Tending · 2D Melon Patch Plant, water and harvest a patch against the clock, with the weather and the pests working on their own schedule. Play ▸

How these were made. A prompt went to stealth/union-alpha through OpenRouter, the reply came back as a complete HTML file, and that file is what you are playing. Where a game needed fixing afterwards, the fix was described to the same model and its patch was applied, so the game code stays the model's own work. The page furniture around each game, the header link and the social tags, is ours and is marked as such in the source.

Who the model is. Nobody has said. Our own measurements find three tokenizer signatures behind the one endpoint, and the strongest named lead is Circuit & Chisel's Pareto on an exact pricing match. The full investigation is here, working included.