This game I have been making for a while, this was not on the video instructions but I used the ball technique to make the jumping bean, I made the ball from two 260 balloons to add weight so that the bean moved along the parallel rails. You could just buy a super ball and insert inside the balloon but I prefer the all latex look, the ball in the picture was made from a clear balloon and each balloon will add approx 30/40 layers to the ball making it very heavy. In the picture I put the ball inside a clear balloon so it could be seen more easily. The problem I found with the rails is that they separate in the middle, you need these to be as long as possible so the bean has more room to travel from end to end but then the middle section separates and the bean will fall through. To over come this I tie a 260 un-inflated around the centre in a figure of eight motion as you need the centre gully to remain on the rails so just tying a 260 around both balloons would not accomplish this, not sure if that is explained to well but hopefully the picture tells a thousand words.