Some codes:
Level
03: NUGGETS (the forest)
04: BOUNCING (the landbridge)
06: BUSTFOOT (the labyrinth)
07: REDDWARF (the desert)
Infinite Lives cheat:
Find: 00 00 29 06
Replace: 90 90 29 06
(it's between the bytes 66BC(hex) and 66BF(hex))
Use an hex editor to do this and make a backup before you begin.
:Titan: