LeapFrog: LeapPad Learning System 3-Book Set with Hit It, Maestro!, Scooby-Doo and I Know Where My Food Goes NOT compatible with LeapPad Explorer Compatible with LeapPad Learning System, Quantum LeapPad, LeapPad Plus Writing, LeapPad Plus Microphone Includes Leap 2 Reading: Scooby-Doo and the Zombie's Treasure; Science: I Know Where My Food Goes; Music: Hit it, Maestro!