Cheat mode
At the castle where you start, go left to the owl swing by the tree. Press A and he will make eight sounds: Fart, Burp, Cluck, or Hiccup. Then, press Start and copy each sound he made in order using the following button for each sound to receive a code. Press C-Left for the Fart sound. Press C-Up for the Burp sound. Press C-Right for the Cluck sound. Press C-Down for the Hiccup sound.

Infinite lives
Pause the game and press C-Up(5), C-Right, C-Down, C-Right.

Infinite energy
Pause the game and press C-Right(2), C-Down, C-Right(3), C-Up, C-Left.

Level select
Pause the game and press C-Up(3), C-Left(2), C-Right, C-Left, C-Right.

Open all levels
Pause the game and press C-Down(2), C-Left, C-Up(3), C-Right, C-Down.

Open check points
Pause the game and press C-Down(2), C-Right, C-Left, C-Up(2), C-Down, C-Left.

Open game portals
Pause the game and press C-Up, C-Right(2), C-Down, C-Left, C-Down, C-Up, C-Right.

Play as Froggy
Pause the game and press C-Up, C-Right, C-Down, C-Right, C-Up, C-Left(2), C-Up. Then while playing as a frog, eat insects to gain extra lives.

Big Glover
Pause the game and press C-Down(3), C-Left(2), C-Down, C-Right, C-Left.

Tilt camera right
Pause the game and press C-Left, C-Right, C-Up(2), C-Down, C-Right, C-Down, C-Right to rotate the camera angle right.

Tilt camera left
Pause the game and press C-Right, C-Down, C-Right, C-Down, C-Up(2), C-Right, C-Left to rotate the camera angle left.

Fish-eye lens
Pause the game and press C-Left, C-Right, C-Left, C-Right, C-Left, C-Right, C-Left, C-Right.

Enemy ball
Pause the game and press C-Left, C-Down, C-Up, C-Right, C-Left, C-Left, C-Down, C-Down.

Locate Garibs
Pause the game and press C-Left, C-Up, C-Right, C-Down, C-Left, C-Up, C-Left(2).

Mad Garibs
Pause the game and press C-Down, C-Right, C-Down, C-Up, C-Left, C-Down, C-Left, C-Up.

Frog Spell
Pause the game and press C-Down, C-Left, C-Down(2), C-Left, C-Down, C-Up, C-Left.

Hercules Spell
Pause the game and press C-Down(3), C-Left(2), C-Down, C-Right, C-Left.

Speed Up Spell
Pause the game and press C-Left(2), C-Right, C-Up, C-Right, C-Left, C-Down(2).

Death Spell
Pause the game and press C-Up, C-Left(4), C-Up, C-Right, C-Up. -From:

Big Ball Spell
Pause the game and press C-Down(2), C-Up, C-Down(2), C-Left, C-Right, C-Down.

Power Ball Spell
Pause the game and press C-Up, C-Down, C-Up, C-Down, C-Up, C-Down, C-Left, C-Up.

Low Gravity Spell
Pause the game and press C-Left(2), C-Up, C-Left, C-Right, C-Up(3).

Unpause
Pause the game and press C-Right, C-Up(4), C-Left(2), C-Down.

Disable all cheats
Pause the game and press C-Down(8).

Unknown
Pause the game and press C-Down, C-Up, C-Right(2), C-Down, C-Left, C-Right(2).

Note 1: Hold L to rise, release L to land.
Note 2: Change '????' to 'FFFF' for quick score gain.