Press the ROTATE button to select the game corresponding to the number, and press the S/P button to enter or pause the game. If the player first presses the S/P button to pause pause, then press ON/OFF key to power off, you can play with the latest progress at next start.LEVEL/SPEED of the game can be adjusted. After pressing the ROTATE button to select the game (do not start the game), press the UP/DOWN buttons to select the pattern of the selected game before starting it; Press the LEFT/RIGHT keys to select the level (LEFT) and speed (RIGHT) of the selected game before starting it.2 AA batteries, the AA battery is easy to buy. Under normal circumstances, 2 AA batteries can last over a month (depending on the quality of the battery).