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The classic video game Tetris is played on the 29-story Cira Centre in Philadelphia, Saturday April 5, 2014, using hundreds of LED lights embedded in its glass facade. (AP Photo/ Joseph Kaczmarek)

Read:Tetris in the Sky: Gamers Play on Philly Building

Frank Lee, right, a Drexel University game-design professor, and game designer Henk Rogers, center, play the classic video game Tetris on the 29-story Cira Centre in Philadelphia, Saturday, April 5, 2014, using hundreds of LED lights embedded in its glass facade. (AP Photo/ Joseph Kaczmarek)

The spectacle kicks off a citywide series of events called Philly Tech Week and also celebrates the upcoming 30th anniversary of Tetris. (AP Photo/ Joseph Kaczmarek)

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