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Tetris is by far the most popular and probably most addictive puzzle game there is. One dude, obviously from Japan, named TGM Holic / jin8 knows this game inside out. This is apparently his choice in life: to kick everybody’s ass playing Tetris. The video clip below shows his total dedication.
Watch as he kills, and then at 03:03 he kills even more – just to finish off with playing the game in invisible mode! If you don’t believe this is real, check this forum discussion.

Try it yourself here (a rather shitty version).
If you’ve got a Facebook account you can play a much better version here.