It helps when you point out these things, otherwise I would've suggested to submit it under the Leapster:
Unlike previous systems in the Leapster series, the Explorer is not compatible with games Leapster or Leapster2 cartridges, although the Explorer is usually backwards-compatible with Didj cartridges.
Are you aware of any Leapster Explorer-specific software?
EDIT: Looks like Leapster Explorer also shares software with LeapPad:
http://shop.leapfrog.com/...tId=LEAPSTEREXPLORER39040Works with LeapPad1™ & LeapPad2 learning tablets and Leapster Explorer™ & LeapsterGS game systems (sold separately).