Once a row or a column of 10 on the grid is filled entirely with blocks, that row or column is cleared of blocks and appears blank again. As the game is played, there are less and less possible spaces to place blocks, so clearing rows and columns is the only way to gain area back on the board.
The goal of this game is to get as many points as possible. The points for each block placed on the board corresponds to the number of squares that the block covers. Blocks range from 1 to 5 squares.