· EASTER EGG: The original SMS 1 unit had a built-in hidden game dubbed “Snail Maze” (see picture). To access it, turn on your Power Base w/o a cartridge. While the Sega Master System logo is coming on, press and hold the directional UP while simultaneously holding down buttons 1+2. Once the logo fully appears, the first maze will scroll onto the screen from the right. There are 12 mazes.

· EASTER EGG:  The SMS model has Alex Kidd built-in.

· EASTER EGG:  Some later system revisions also have built-in games (such as Missile Defense,  Hang On/ Safari Hunt, or Hang On/Aster Warrior).