Choose a game mode

Local 1v1 Play on the same screen with a friend vs AI (Easy) Stone-count minimax, 0.1s per turn vs AI (Medium) Stone-count minimax, 1s per turn vs AI (Hard) Stone-count minimax, 5s per turn vs AI (Very Hard) Stone-count minimax, 60s per turn Online Multiplayer Play with a friend over the internet Active Games Resume your ongoing online games Leaderboard Top rated players Annotate Positions Help train Sigil's AI by labeling ambiguous positions Account Sign in for ranked play and ratings Rulebook Official rules (PDF) Discord Join the community to chat and find opponents
Expansion packs (core is always included; Panda games are unrated)
Empty board start; both players blink onto any node for their first move. Win only by eliminating all of your opponent's stones. Unrated.