The game consists of finishing several levels, solving by clicking with the mouse or using the keyboard to complete the tasks. Classic - by clicking on a square, the others around it change inversely (cross). Do this until all the squares are 0. Pusher - with the help of the keyboard, press the key indicated on the screen, until the matrix is ​​completely finished. Counter - Click on the square until it reaches 0, every time you click, it decreases by 1, but be careful, if the number is negative, you lose the game.