In the game, there are colored markers in several tiles. You should try to link like colored markers. You can click left mouse button on one marker and hold it. Then draw across cube and once it reaches another same colored marker, you shall release left mouse button. Link every pair of like colored markers to complete a cube. You can not link cells diagonally. If you break an existing link, reselect the broken link color by clicking on one of the two markers, then plug and gaps. Black cells are blocked. Once a cube is completed, it will break to pieces. Then you can move to the next level.