The full catalog

A single-instruction computer where every program is built from nothing but "subtract and branch". Free, brutal, addictive.

MIT’s annual AI programming competition. Command an army of bots with distributed strategy and battle other teams for the title.

A hypnotic ASCII auto-RPG where you write StoneScript to automate your character’s combat, looting and exploration.

A programming-based incremental: script your way through a cyberpunk net, automate hacking with a NetScript API, and break the simulation.

Solve puzzles and fight other players’ bots in real-time arenas. Write in 25+ languages and watch your code play out as an animated game.

Drag visual instructions to automate your white-collar job. A gentle, beautifully made intro to assembly thinking — no syntax required.

Program pairs of waldos to build molecules on an assembly line. The original Zachtronics visual-programming puzzler.

Aliens abduct you to build factories in 3D. Lay out blocks and conveyors to assemble products under their watchful eye.

Guide a robot through alien ruins by writing instructions in a clean, purpose-built language — no prior coding needed.