Tetris, the simple puzzle game about stacking shapes and clearing lines, is turning the big 3-0 on Friday.
It's hard to believe Tetris is old enough to start worrying about mortgages and child care costs, but the iconic game has had an impressive life. Ported to almost every platform imaginable, Tetris has sold more than 186 million copies, according to the The Tetris Company.
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To celebrate the milestone, we rounded up some of the most interesting, surprising facts about the mega-hit.