Take turns placing a stone on any empty hexagon. Stones never move and are never taken.
Red wins by joining the top and bottom edges with an unbroken chain of red stones. Blue wins by joining the left and right edges. The edges are drawn in each player’s colour.
Swap rule (on unless turned off under New game): right after the first stone, the second player may press Swap instead of placing a stone. The first stone becomes theirs, mirrored across the board so it faces their edges, and the first player moves next. So the first player shouldn’t open too strongly.
The board can never fill up without one player connecting, so there are no draws.
Games won are kept, and the starting player alternates each game.
Red stones carry a cross and Blue stones a ring. Keyboard: arrow keys move between hexagons, Enter or Space places a stone, Ctrl+Z (Cmd+Z on a Mac) undoes.