TheGameSite: Tips, Cheats, Walkthroughs: N64: Body Harvest
FAT LEGS
Start a new game and enter your name as "ICHEAT". Left, A, Right, Down. This makes aliens' legs bigger. Aliens must be present for this to work.
MUTANT CHEAT
C-Down, Up, Z, Z, C-Right, Right. If a harvester is present, this code will turn instantly it into a mutant.
MUTANT CHEAT
Start a new game and enter your name as "ICHEAT". C-Down, Up, Z, Z, C-Right, Right. If a harvester is present, this code will turn instantly it into a mutant.
SERIOUS WEAPONS
Start a new game and enter your name as "ICHEAT". C-Down, C-Up, Up, Z, Z, Left, C-Right. Increases weapon damage.
SURREAL
Start a new game and enter your name as "ICHEAT". C-Down, Up, Right, Right, C-Right, A, Left. Makes the buildings bounce, and hard to enter.
WEAPONS CHEAT
Start a new game and enter your name as "ICHEAT". A, Right, C-Down, C-Right, C-Up, A, Left. Gives you all available weapons for that stage.
WEAPONS AND WACKINESS
Begin a new game and enter ICEHEAT as your name. During play, press bottom C, top C, Up, Z, Z, Left and right C to increase the power of your weapons. To activate Surreal Mode and make the buildings dance, press botom C, Up, Right, Right, right C, A and Left.