Anytime during the game, pause and then press the following buttons in sequence: Select, Left, Right, A, B, B, Left, and Right.
Pause the game at any time and enter the following buttons in sequence: Select, Left, Right, L, R, Left, Right, and Select.
During "Level Ate", when you reach an area where a bacon strip is next to three forks, jump and hold the A button and try to navigate yourself between the bacon and forks. This should teleport you to a secret level called "Totally Forked."
To jump a level enter the following codes to get to the desired level ...
Lorenzo Soil - P 9 V N L 8
Puppy Love Part 1 - F 1 L D B Z
Villi People - N 8 T N L 8
The Flying King - J 4 P J G 4
Puppy Love Part 2 - G 2 M G D 2
Udderly Abducted - K 5 Q J G 4