Works with Leapster or Leapster 2 game systems. With very few exceptions, all LeapPad game cartridges and apps work with all LeapPads. Some digital apps are only designed for LeapPads and cannot be used with Leapster Explorer – these apps are designed to take advantage of the LeapPad’s larger screen, motion sensor and microphone and so are not able to be played on Leapster Explorer. i took this off the leap frog site.