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September 1, 2014

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The classic video game Tetris is played on the 29-story Cira Centre in Philadelphia on Saturday, April 5, 2014, using hundreds of LED lights embedded in its glass facade. The spectacle kicks off a citywide series of events called Philly Tech Week and also celebrates the upcoming 30th anniversary of Tetris.

Joseph Kaczmarek / AP

The classic video game Tetris is played on the 29-story Cira Centre in Philadelphia on Saturday, April 5, 2014, using hundreds of LED lights embedded in its glass facade. The spectacle kicks off a citywide series of events called Philly Tech Week and also celebrates the upcoming 30th anniversary of Tetris.