Here's a really nice example of "Moon Probe", a test of hand-eye co-ordination. The object of the game is to use the ball's falling motion to propel the ball UP the ramp & drop it in the last hole. The board is made of stained oak, the ends are pine, 2 metal rods & a 1 1/8" diameter metal ball, & it's all in excellent condition. Playing field is 18" long x 4" wide. Even you can defy gravity.