GREMLIN 11:
Left, Right, Square, Circle, Up, Down, Square, Circle

SUPER FURY ANIMALS:
Left, Left, Square, Right, Right, Circle, Up, Down.

GHOST BALL:
Square, Square, Left, Left, Right, Right, Circle, Circle.

BEACH BALL:
Left, Right, Left, Up, Left, Right, Square, Square.

SMALL PLAYERS:
Circle, Down, Down, Square, Up, Up, Left, Right.

INVISIBLE PLAYERS:
Square, Circle, Down, Circle, Up, Right ,Square ,Left.

GIGANT PLAYERS:
Up, Down, Down, Right, Square, Square, Circle, Circle

BREAK REFLECTORS:
Left, Left, Left, Circle, Right, Right, Right, Square.

BLACK-WHITE COLOR TV MODE:
Up, Down, Up, Square, Circle, Up, Down, Up.

If you have successfully activated a cheat, a string of text will pop up about 75% of the way down the screen for about 2 seconds.
All cheats have to be explicitly off. For example, once you have activated the giants cheat, the players will be giants until you re-enter the cheat. Active cheats are saved as part of the saved games.