15 × 15
A classic full-size grid with nine live-switchable board palettes.
Five means five.
Synapse uses one clear rule for both colors: exactly five stones in a row wins. An overline does not, and there are no double-three or double-four bans.
1, 3, or 5 minutes
Server-authoritative clocks continue reliably through refresh and reconnect.
Black, white, or random
Random assignment is resolved on the server for a fair side choice.
Rated live play
Ratings and match history remain separate from the cognitive-game score.