1. Each box has two states, free state (white square) and fill state (color square).
2. The initial state is free state, when the box is clicked, then the current state of the box will become the opposite state, namely: discoloration.
3. At the same time the box adjacent to the box (not including the diagonally adjacent box) will also change the state of the box, and the game will end when all the boxes have filled.
4. try to challenge more orders of difficulty of the game ~ ~