This is a very simple memory game. The aim of the game is to take black and white balls to the exits. Each ball has its output, these balls are in their fields, that never meet. It would seem that these balls have nothing in common, but it is not. Both balls move synchronously, parallel to each other, so the movement of balls must satisfy the conditions as the first field and the second. Also exit on the field there are cells that can not go, otherwise the game will start again.