Click and drag a tile to slide it. You can slide a tile in any direction, and it will keep moving until it hits a wall or any other tile. Your goal is to make a correct mathematical equation, and place all the tiles on the checkered spots. Equations can work left and right or up and down, and sometimes you'll need to make two equations using one mathematical operator.

In later levels, you can use portals to teleport tiles. If you make a mistake, press the restart button.