Click with the mouse on any block and drag out a rectangle having all four corners of the same color to free it and get points and time. Free all blocks before the time has ended to go to the next level.

Click with the mouse on any block and drag out a rectangle having all four corners of the same color. Objects inside only indicate which bricks you have freed. You can use them as corners again. Release the mouse button to collect all blocks inside the rectangle. The bigger the rectangle is, the more points and time you will get. Free all blocks before the time has ended to go to the next level.