It's Sudoku in color! Rainbow Sudoku is a puzzle that works on the same principle as a Sudoku. It is composed of 81 balls of 9 colors. The young player must distribute the wooden balls on the board with the objective that no colour is repeated on a line, column or square of the large wooden board. 104 cards offer different starting points of progressive difficulty. With Rainbow Sudoku, the child develops his or her reasoning and logic, alone or with others. Contents: 1 wooden tray (species: Hevea brasiliensis), 81 wooden balls of 9 different colours, 104 puzzle cards, 1 solutions booklet.