On the Sega Mega Drive, the Game Genie can function as a country converter and bypass the TMSS (TradeMark Security System) since most of these games are only "locked" to their respective regions by the shape of the cartridges and a set of a few bytes in the header of the ROM. Today, these codes and many others discovered by players can be found for free online. In addition, Galoob also ran ads in certain gaming publications (such as GamePro) that featured codes for newer games. To address this, an update system was implemented, where subscribers would receive quarterly booklet updates for a fee. However, these booklets would eventually become inadequate as new codes were discovered and new games were released that were not covered. The Game Genie was usually sold with a small booklet of discovered codes for use with the system. In rare cases, codes even unlock hidden game features that developers had scrapped and rendered unreachable in normal play (an example of this is the final Hidden Palace Zone in Sonic the Hedgehog 2). The most popular codes give the player some form of invulnerability, infinite ammunition, level skipping, or other modifications that allow the player to be more powerful than intended by the developers. These codes can have a variety of effects. The Game Genie cannot manipulate RAM, though it can make the console read different values from SRAM.īecause they patch the program code of a game, Game Genie codes are sometimes referred to as patch codes. Each code contains an integer value that is read by the system in place of the data actually present on the cartridge. Upon starting the console, the player may enter a series of characters referred to as a "code" or several such series that reference addresses in the ROM of the cartridge. The Game Genie attaches to the end of a cartridge and is then inserted into the cartridge port of the console for which it was designed.
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