Each box has two states,the free state (white box) and the occupied state (color box). The initial state is free state, when the box is clicked, then the current state of the box will become antagonistic state, namely: discoloration. And the box state of the adjacent block (which does not contain diagonal adjacent squares) also changes, and the game ends when all the squares are in the occupied state.Try to challenge more order of the game more difficult it ~