Play like ordinary Tic-Tac-Toe, with one exception: You can press the "Shake it up" button to make all the pieces fall to the bottom, a bit like connect four. This will be your turn (you can't click the button and place a letter on the same turn.) Oh, and you can't waste a turn by "shaking it up" when nothing will fall. The button will be black when you can use it and gray when you can't.
100% me.