Gex: Enter the Gecko Game Cheats

Toggle the Mona Lisa
In the first level, next to a door will be a book case. Do the tail attack on the books, and the bookcase will retract. Flip the lever, then super-jump up to the picture of the Mona Lisa. It will give you an option to turn it on or off.

255 Lives
To get 255 lives, the maximum number of extra lives attainable, do the following:

Enter a level that has a bottomless pit (such as Scream TV: Smellraiser) with one life left.
Fall down that bottomless pit.

Right when Gex is keeling over to die, exit the level with the start button menu. You will now have 0 lives left. Repeat steps 1 - 3 once more.

You will now have 255 lives left. The downside to this cheat code is that you will need to find a NEW red remote control before you can get a working password.

All Remotes
Enter this code at the password screen. Hold B then press DOWN 20 times Hold B then press UP Hold A then press RIGHT Hold A then press LEFT twice Hold B then press DOWN twice Hold B then press RIGHT Hold A then press RIGHT

Full life and max items
To get full life you need to beat the game and then play the first level. Kill all the sharks and the game will go to a blank screen. You will have maximum of everything