Use your Up arrow key to change the orientation of the box shapes as they are descending, the Left and Right arrow keys to move the shapes horizontally across the screen, and the Down arrow to speed up the speed with which the boxes fall to the bottom. The way that this game differs from Tetris is that some of the boxes contain Firecrackers, Rockets and Cherry Bombs. Firecrackers blow up all the boxes around them when they land, thus destroying the rows you are trying to build. Rockets blow up all the boxes in a row. When you remove a row with boxes that contain Cherry Bombs, you capture the bombs and can use them to blow up the bottom row at any point in the game, using your Spacebar. Hope you have fun!