Tetris
1. Press the down arrow to begin the game
2. Fill an entire row with blocks to remove it and earn points
3. Press the Escape to pause/unpause the game
3. Press the Spacebar to instant drop the piece
3. Press the r to restart the game
4. Change the difficulty to increase beginning speed
5. The Game ends when the top row has been reached an no more blocks can be placed
6. Have fun!