Gex - Enter the Gecko

Press [Esc] to pause the game at the central
(Media Dimension) area. Then, hold H and press
[Right] [Right] [Left] [Right] [Space] [Down] [Right].
Press [Esc] to resume the game, then press [F1] to
display three cheat menus.
Note: Cheat mode must be reactivated
after completing the next level.