This game is similar to tetris in which you need to fill up rows with blocks to clear them. Each time, rows of blocks will appear from the bottom. The blocks may have different widths but are all one unit tall. You can slide a block to its adjacent spaces. If you slide the block to a position where the spaces underneath are also empty, then the block will fall down to the row below. And if the row below is fully occupied, the row will be cleared. Another way to clear rows is to slide a block away so that the block above falls down, potentially clearing a row as it lands. If you clear multiple rows in one move, electric blocks will be formed. When you destroy an electric block, all the blocks touching the electric block will also be destroyed. If you cannot clear the blocks and they are stacked to the top, then the game is over. The more rows you clear, the higher your rank.