GAME GENIE!
Game Genie is the video game enhancer from Galoob (Codemasters), first introduced in 1991 and available in five different models for the Sega Genesis and Game Gear systems, the Nintendo Entertainment System, the Super Nintendo Entertainment System and the Nintendo Game Boy system.

With Game Genie video game enhancer, you can change and customize game play and create special effects on many popular video games. For example, you can have more lives or weapons, start on any level of the game, jump higher, be invincible, and more. The changes you make with Game Genie are not permanent, and disappear when the power to the game deck is turned off.

Game Genie, invented by Codemasters in England. It is a cartridge-like pack that connects between the game cartridge and the game deck. It introduces its own startup screen, called the "Code Screen." On this screen, you enter
special letter codes chosen from the accompanying Game Genie Codebook to create the effects you want. Or, you can program your own codes.

If you have a new model Control Deck:
Your Game Genie doesn't fit in the new model NES deck. Some time ago Nintendo changed the design of their NES deck and as a result some titles don't work properly with the Genie. You need to call the number on your Game Genie and tell the operator that you have a new model NES deck.

DO NOT FORCE THE GAME GENIE TO FIT INTO THE NEW MODEL CONTRAL DECK.
If you are having a problem using the Game Genie with any NES game:

If the Game Genie Code Screen is not appearing

Be sure that the game, the Game Genie, and the NES Control Deck are clean. Any type of NES cleaning kit should work fine. Be sure that the Game Genie and the game are connected properly and are pushed FIRMLY ALL THE WAY into the NES Control Deck.

If the screen just blinks after you press "start" at the Code Screen
Be sure that the game, the Game Genie, and the NES Control Deck are clean. Any type of NES cleaning kit should work fine. Be sure that the Game Genie and the game are pushed FIRMLY ALL THE WAY into the NES Control Deck.

Damage on Cartridges:
The GameGenie can damage your NES cartridges, even though the maker claims it cant. I've received a couple of e-mail from people who have experienced that the GameGenie damaged some of their games.

I've had the same experience with the GameGenie damaging NES games. The first one was Super Mario Bros 3 where the screen completely screwed up.

One was Capcom's Gold Medal Challenge where the GameGenie destroyed one of the savegames and it I was not able to remove or overwrite the savegame.

So, if you want to keep your NES carts for a long time... my advise is not to use the "Genie" with your own carts. Ofcourse you can use it on the neighbours or those you rent