In Wappy Dog, you must get all the different hay balls to the top of the tree in the center of the screen! The more balls you get, the more points you will earn.- You can either move the ball up the screen or to the bottom to get it to the end of the tree. The game is easy to play, but the challenges come when you need to get all the balls to the top of the tree in the correct order. Woppy Dog is a new game from Nintendo DS and it is based on the popular title Tetris. The object of the game is to get as many balls as possible to the top of the tree in the correct order, without breaking the game rule that says each ball must be on the same spot at the same time.