James Pond 3 Cheats

Destroy all the cheese mines and stiltonium machines to get the good ending.

At the password screen, enter the following symbols: Red Cheese, Yellow Mouse, Green Cat, then Blue Dog. After that, add in any of these behind those symbols:
Red Fish for Invincibility
Red Book to have All Areas Unlocked
Red Star to start with five energy
Red Skull to start with one energy and one life
Red Teacup to have All Cheese Mines destroyed
Red Cupcake to have the gun always start with Homing Cupcakes
Red Dog to always have the X-Ray Specs

Then, leave the password screen by selecting the door icon, and start the game.