The phrase refers to the act of acquiring a modified version of the classic 1985 Nintendo game, Super Mario Bros., in the form of an APK (Android Package Kit) file. This typically implies obtaining it from a source other than official app stores. The modified version can introduce altered gameplay mechanics, different characters, new levels, or other enhancements not present in the original release. An example would be downloading a file that unlocks all levels or provides infinite lives.
The appeal often lies in the desire for a novel or personalized gaming experience. It can provide players with an altered challenge, access to content not originally available, or a way to circumvent in-game restrictions. Historically, this type of distribution has been a way for independent developers or hobbyists to share their own creative takes on popular games, extending their lifespan and appeal beyond the original intent of the creators. However, obtaining and using such files carries inherent risks.