Here's an ad for the legit NES version of tetris. as for why the nintendo version is considered "legit"? well, it all started with the trial regarding the ownership of the rights for Tetris between Nintendo and Atari (which owned Tengen). long story short, the court ruled in favor of Nintendo and it led to 2 things: the first and most well known effect was that Tengen was asked to recall any unsold copies of their version of Tetris and have them destroyed. the second effect was that Sega (who made their version of Tetris) lost the rights as well, but in the process it led for them to create Columns.
P.S. i am fully aware that there is a small bit featuring the former World Trade Center. and as a result, i won't tolerate any "9/11 is a conspiracy" type of comments. any comments which reflect such opinion will be deleted.
