The domino can be extended not only one after another but also one on top of another. In this case, there is an arm at the end of on of the domino rows which knocks down the domino in the lower/upper row. When you have put up every stone, you can begin at the top or at the bottom. Children watch concentrated the flow of impulse and grown-ups are also fascinated by the process. At the bottom you can use normal walldomino and in the raws above ones with left or right arms.
Learning Effect: Kid‘s eyes are glowing, and they are thrilled to watch the domino effect. Even adults are again and again fascinated by this game.