** The fates of the Tengen version of NES ''Tetris'' and the [[SegaGenesis Genesis/Mega Drive]] port of Sega's arcade version of ''Tetris''.
** Beginning in [[TurnOfTheMillennium the 2000's]], the Tetris Company began enforcing guidelines on what a game carrying the ''Tetris'' name should be like, such as exact playfield dimensions, piece colors, and piece behavior, especially piece rotations. This proved to be a problem for developers like Arika that have their own ideas on ''Tetris'' games.
* KillerApp: This game ''made'' the GameBoy, and it was packed in with the system for years.
** Most versions based on Sega's original arcade version.
** ''Tetris 64''.
* PortOverdosed: Arguably the most widely-ported game in history. It is said that if you can program it, someone has made a version of ''Tetris'' for it, up to and including the sides of buildings.