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 check points
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 in to 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).