2 players, 5×5 dots and 16 boxes. Draw one unused horizontal or vertical edge between neighbouring dots. No diagonals, gaps or repeated edges. Completing a fourth edge claims the box and gives another turn. One line can claim two boxes; you still continue the same turn. Otherwise, pass the turn. After all 40 edges, most boxes wins, with draws possible. Original code and visuals; mechanics reference Cambridge NRICH's two-player Dots and Boxes activity.

Rooms expire 24 hours after the last action. Refresh to reconnect; leaving ends the current game.