1.Each block has two states, that is, the free state (the white square) and the occupied state (the color square).
2.The initial state is free state, and when the block is clicked, the current state of the block will turn to the opposite state, that is, discoloration.
3.At the same time, the block state adjacent to the block (which does not contain a diagonal adjacent square) will also change, and the game ends when all the squares are changed to occupied state.
4.Try to challenge more degrees of game difficulty.