It's Sudoku for people who are more visual than math-based.
Start with clues from one of the 104 puzzle cards, and then try to place a single ball of each color in every row, in every column, and in every 3 x 3 box.
The ColorKu Game board and colored balls are made from high-quality solid wood;
Age Recommendation: Ages 8 and up
* Warning - choking hazard. Keep away from small children.