SEGA produced this Mega Drive conversion of their hit arcade version in anticipation of being able to win the rights to the home versions from Nintendo in court. The game had been manufactured and was ready to ship, but SEGA did not end up winning the legal battle, and they were unable to be sold. The cartridges were left to rot in a warehouse and, ultimately, were presumably destroyed. A handful of copies have, however, found their way into the open market.
The Megadrive (Genesis) version of Tetris
is one of the rarest and most sought after games and the game is honored as such in the 2008 Guinness World Records Gamer's Edition. Less than 10 copies are known to exist. There are, however, numerous bootlegs of Chinese origin floating around.