Cellmoku

Two players take turns placing stones. Black moves first, and White moves second.

The board Stones can only go on cells. The game starts with just 8 cells in a 3×3 ring with an empty center, and squares without a cell are shown dark. The board never grows beyond 13×13.

Your turn 1. Place a stone on an empty cell. 2. Count your own stones on the 8 squares around it (diagonals included). You earn that many new cells. Your opponent's stones don't count. Before you play, hover over an empty cell to see blue lines to the stones it would count. 3. Place all your earned cells this turn, one at a time, on empty squares that share a side with an existing cell (shown in green). You can build off cells you placed this turn, and they don't have to be near your stone. If there is no room left, the remaining cells are lost.

If you earn no cells, your turn ends as soon as you place your stone. Cells placed by a player show a border in that player's stone color.

How to win Win by making a line of 5 or more of your stones in a row, column, or diagonal when you place a stone. Six or more also wins, and there are no forbidden moves. Placing cells never wins or loses the game.

Draw If it becomes your turn and there is no empty cell to place a stone on, the game is a draw.