Blocks of different shapes drop from the top of the screen As the blocks fall they can be rotated or moved horizontally to position them to create a horizontal line. When a line is completed. that line is removed and the blocks above it are moved down by one square. You gain points for each line and bonus points when mutiple lines are completed at the same time.The box at the right show what kind of block will appear next. The higher the level. the faster the blocks fail.When the blocks reach the top of the screen the game ends.