The vast majority of non-computer gaming platforms since the Atari 2600 era have required approval by the platform owner (Nintendo, Sega, etc.) before a game can be published, usually requiring the completion of a feature checklist to ensure compatibility and reduce the amount of, well, crap. This category covers unlicensed games - usually produced by bootleggers - that bypass whatever copy-protection systems were put in place in order to avoid going through the costly approval channels.
Unlicensed games
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