Games · draft v0
All games.
The Lifelong Arcade games A to F each have their own rules; G, H and I mix them. Pick one to play, then use Prev and Next to move between games. Skirmish and the earlier worlds follow.
Take the scored test: all 28 levels once, in order →
Survival prototype
Earlier worlds
Chess, the island, the mouse meadow, the grid world and the first survival recording, with their original rules. All use scripted agents.
Chess
October 27, 2026 · Playable game
Standard chess with full FIDE rules, laid out like a lichess board. Play both sides or face the random baseline agent; the same integer action space is what an agent steps.
Environment API
Plain chess, FIDE rules: castling, en passant, promotion, checkmate, stalemate, threefold repetition, fifty-move rule, insufficient material. ChessEnv.reset() and step(action) move one side per step. Actions: from·64 + to (a1 = 0 … h8 = 63) for ordinary moves and queen promotions, 72 under-promotion ids from 4096. Observation: 19 × 8 × 8 planes from the mover's view (own pieces, their pieces, colour, castling rights, en-passant file, fifty-move clock). Reward: 1 for delivering checkmate, 0 otherwise, −1 for an illegal action. Pieces: cburnett set (Colin M.L. Burnett).
Clone an environment and try your own agent → · Chess on its own page → · The Target Drift / Mountain Car demo →