Similar to the Tetris Magnets and Tetris Shelves, these Tetris blocks are made for children 4 and up to fool around and smack each other with. Great for building up your kids' spacial recognition and organizational skills as well.
You'll have to be careful they don't line them all up in a row though, or else the blocks will disappear and you have to buy another set. Wait, the ref's coming over to say something. Reuse of old joke, 5 yard penalty, still 2nd down.