Use these codes to unlock levels (only for the European version):
257462320: Small Map
1585104494: High Altitude map
221350867: 4 submarines
241780260: Long map
1: goat level
These are codes for the American version:
doggystyle: Lunar map w spaceship & laser gun Jamie Finegan: Large island level
finalfantasy: Small winter island
steller: horror style map
spire: Low map with 2 blimps
sugarcult: Large winter map
slipknot: Pirate map with airship
7873155: English map with bridges
90210: Some hour glasses and islands