Linkhallow

Linkhallow is the classic connection game Hex. Amber places stones to join the top and bottom edges of a rhombus board, Teal to join the left and right; there are no draws, so somebody always links. Play on 7x7, 9x9 or 11x11 against an AI that runs Monte Carlo tree search with a time budget (Easy, Normal or Hard), or against a friend on the same screen. The optional swap rule lets the second player take over the opening stone, undo takes back a move, and the winning chain lights up when a game ends. It plays in the browser with a keyboard, mouse or touch.