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Help:Contents/Terminology/Game Genie

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Title Screen

Game Genie

Developer: Codemasters
Publishers: Galoob (US), Hornby Hobbies (EU)



This is a sub-page of Help:Contents/Terminology.

Cactus feels all lost and stuff.
This page discusses the background and technical aspects of the Game Genie device. Game Genie, as disambiguation, refers to:

A Game Genie is a cheating device that patches the ROM of a game to allow for various benefits, challenges, or unused items. It was released for various systems, including the NES, Game Boy, SNES, Genesis/Mega Drive, and Game Gear. It sold over five million units worldwide, and paved the way for later cheating devices such as the CodeBreaker and GameShark.

Each Game Genie came with a book filled with codes for then-current games, and people could subscribe to a mailing list for updated codes. Thanks to the internet, you can find codes through a simple Google search or dedicated sites like GameGenie.com.

Later versions of Game Genie for Nintendo systems included the ability to let the device's changes be undetected by checksums Nintendo had added to later games for this specific purpose (introduced during its lawsuit against Galoob, which the Big N lost). Sega, on the other hand, heartily endorsed it.

Hmmm...
To do:
Any more code format documents? Any pictures of the code screen for all systems? Also, is it even possible to dump the Game Gear version, given its shape?

NES

Code Format

A diagram that explains the code format.

An overview on the code format for the NES version can be found at romhacking.net.

Download

According to Zophar, the NES version is in the public domain, and can be downloaded here (a disassembly is also available). Emulation has allowed Game Genie (usually combined with Pro Action Replay) to be "connected" to the console at all times, making the ROMs little more than historical artifacts.

Hardware

In Action