John Clemente plays Tetris, a puzzle video game, at Barcade in the Brooklyn section of New York. Completed in 1984 and made available as a computer game in 1985, Tetris is perhaps the world's most recognized video game. Still played by millions around the world, on Facebook, the iPhone, on computers and gaming consoles, the casual game pioneer celebrates its 25th birthday this week.
AP Photo/Mark Lennihan /
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