You probably know how Tetris is played. Line up the blocks to create a solid row, and the row will disappear. So it makes sense (kinda) that in Anti-Tetris the goal is to prevent the blocks from disappearing. Use your arrow keys to guide the blocks downward (use the up arrow to rotate; down arrow makes blocks go faster; left and right... well, you get the picture). Be careful, because if you "sandwich" a single color between two identical colors, the row or column will disappear and you'll lose points. For more detailed instructions, check out the in-game help menu.