Challenge your mental skills while having loads of fun! Duncan's Color Shift Puzzle Ball can be solved by matching all of the colored balls with their corresponding colored rings. To start, re-arrange all the colors by pressing a ball into the centre and shift if to a nearby hole. There are 12 holes and 11 balls - so use the one empty hole to maneuver balls around and find their matching holes. Once all the balls match, the puzzle is solved! How fast can you do it?