You can't find too many people who have not played the video game, TETRIS, but you definitely will not find anyone who has played it on a screen this size.
In fact it's not a screen at all, but a skyscraper in Philly.
It was done to celebrate the upcoming 30th anniversary of the global phenomenon game in the late 1980s.
People were actually able to play the game on the skyscraper, it was not just an exhibition of lights.
Hundreds of Tetris fans got to play a super-sized version of the game on the side of a building.
Using just a joystick, they were able to move the interlocking shapes on the 29-storey Cira Centre in Philadelphia
The building, which has hundreds of LED lights embedded in its glass facade, normally displays colourful geometric patterns at night.
But on Saturday, images of Tetris shapes fell on two sides of the mirrored tower as competitors were at the controls.
The giant game kicked off a series of events in the city called Philly Tech Week and the aim was to inspire onlookers and players to think about the possibilities of technology. Giant Tetris played on Philadelphia Some people dressed up for the occasion
It also celebrated the upcoming 30th anniversary of Tetris which challenges players to rotate and arrange falling shapes into complete rows.