Level Codes
Go to the password screen from the main menu and enter these:
Level 02 - pigpede
Level 03 - yetis
Level 04 - twoseater
Level 05 - caverns
Level 06 - forest
Level 07 - swamp
Level 08 - chickens
Level 09 - factory
Level 10 - rooster
Level 11 - maze
Level 12 - clem
Level 13 - endmovie
Level 14 - bonus