About

This puzzle consists of 8 numbered balls which can roll around a 3x3 square. There is a restriction that differentiates it from a simple 3x3 version of the fifteen puzzle. There are walls on the left and right side of the centre position, so that a ball can enter or leave the centre in a vertical direction only. In the solved state the centre spot is empty, and balls are in clockwise numerical order starting from 1 at the top left corner. This puzzle was invented by Joshua Frankel, and manufactured by Binary Arts, now called ThinkFun. If your browser supports JavaScript, then you can play Diamond Eightball by clicking the link below: