Use the following cheat codes to enable the corresponding effect:
DEADREDPARTYSHOES: Feet Norman/Big
BUTTCHEATCANSURPRISE: Head Normal/Big
YESTERDAYYOURZEBRADIE: Clear Map
ANYANDALLCODE: Unlock Doors
FRIENDLIESTGODINGALAXY: Weapon Level Up
FISHINABARREL: Unlimited Ammo
CHARLIEHUSTLEOVERDRESSEDROMEO: All Weapons
COOLLEVELCHEATCODE: Open All Levels
CHARLIEOSCARLIMADELTA: Enemies Thawed/Frozen
CANEREADYTOROCK: Restore Health
CHARLIEALPHANOVEMBERECHO: Time Factor
NOPAINNOCANE: God Mode