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.

Bonus levels
Pause the game and press C-Down, C-Up, C-Right(2), C-Down, C-Left, C-Right(2). If you entered the code correctly, Glover will cheer. Then, several cheat codes will be displayed and all six bonus levels will be unlocked.

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

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

Open all levels
Pause the game and press C-Down(2), C-Left, C-Up(3), C-Right, C-Down to unlock all levels in worlds that are uncovered, or all levels if the "Open portals" code has already been enabled.

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.

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.

Death spell
Pause the game and press C-Up, C-Left(4), C-Up, C-Right, C-Up. Then, press R to cast the spell and kill all opponents.

Frog spell
Pause the game and press C-Down, C-Left, C-Down(2), C-Left, C-Down, C-Up, C-Left. Then, press R to cast the spell and turn all opponents into frogs.

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

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

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.

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

Invisible ball
Pause the game and press C-Down(2), C-Left(2), C-Up(2), C-Down, C-Up.

Summon ball
Pause the game after losing the ball, then press C-Up, C-Left(2), C-Up, C-Right, C-Left, C-Down, C-Up.

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

Boomerang ball
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).