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Gigantic Tetris game projected onto skyscraper

All eyes were on the 29-story Cira Centre in downtown Philadelphia on Saturday, as hundreds of of people gathered to watch and participate in the largest-ever game of Tetris.

The event kicked off Philly Tech Week 2014, and the two-player challenge was recreated via more than 1,400 LED lights on the north and south sides of the 437-foot building.

The weekend's spectacle followed last year's enormous Pong gaming tournament, hosted on one side of the Cira Centre. The successful experiment earned Dr Frank Lee of Drexel University the Guinness World Record for largest architectural video game display—a record Lee believes he broke on Saturday.

"It is the biggest Tetris [game] in the world, but beyond that, it will be the biggest video game in the world," he told the New York Times (video below), adding that he now just has to apply for the record.

With the support of the Brandywine Realty Trust and Drexel University—where Lee teaches gaming courses—the two-sided digital competition covered 100,000 square feet of the building, almost doubling the 59,800 square feet of last year's Pong tournament.

But Lee added a twist to the traditional game, which celebrates its 30th anniversary this summer: Instead of simply dissolving each row as it is completed, the eliminated lines were added to the challenger's gameboard, upping the ante in an already imposing match.

"This project began as a personal love letter to the games that I loved when I was a child—Pong last year, Tetris this year. But it ended up as a way of uniting the city of Philadelphia," Lee told the Tech Week crowd, the Associated Press reported.

The Philly Tech Week festival runs through Saturday, and boasts entertainment like classic arcade games, local food trucks, and live performances.