Hundreds recently turned out to watch the world's largest game of Tetris played on the side of Philadelphia's 29-story Cira Centre building as part of Philly Tech Week.
LED lights were installed on the 437-foot building, turning its north and south sides into a 100,000-square-foot screen. People played the massive game using regular-sized joysticks.
This year's event follows a record-breaking game of Pong played on the same building last year. Tetris was initially unveiled in 2013, which is when this video was taken.
Related on MNN: Tetris may treat PTSD, flashbacks