Flintstones: Burgertime in Bedrock Cheats (GameBoy Color)

Enter the following combinations of icons at the password screen to unlock the
corresponding level: 
  Level 2: Fly, Blue Dinosaur, Gazoo, Snaggletooth 
  Level 3: Alligator, Alligator, Snake, Gazoo 
  Level 4: Frog, Fly, Snake, Gazoo 
  Level 5: Alligator, Snaggletooth, Snaggletooth, Snake 
  Level 6: Gazoo, Dinosaur, Fly, Crocodile