The aim is to make complete lines, which disappear, giving you points. Falling blocks, of various shapes, can be rotated or moved to the right or to the left. The keyboard arrows are used to move the blocks. The space bar is used for fast falling. The small upper right window shows the next block to fall.
You can play against an opponent. Ask the person in charge of the computer if you can. If this is the case, the left side player’s keys are «a» and «d» for left/right motion; «s» and «w» are used for rotation and «q» for fast falling. The fast falling key for the player on the right becomes «/».