A new take on Tetris called Lummo Blocks lets you use your body as the controller for directing the motion of the famous falling blocks. Playing with a buddy, one of you takes charge of moving the blocks left to right, and your partner controls the blocks' rotation, all in the public space of a Spanish plaza. Will strangers help or hinder you as you try to create lines of blocks?

Who among us hasn't played Tetris?

Tetris, one of the most successful, and copied, games of all time, celebrates its 25th anniversary this week, according to the company that now controls the rights to the game.