This game is an adaptation of the classic Tetris game.
The 4 keyboard arrow keys are used to manipulate the tiles: left to move left, right to move right, up to rotate counter-clockwise 90 degrees and down to hard-drop the tile. You can use the space bar to pause and unpause.
Each time you clear 10 lines you go to the next level. Levels continue as long as you don't lose the game.