Sudoku Rainbow

Sudoku Rainbow is the traditional nine by nine puzzle made with colors instead of numbers. The colors can be selected from a palette of nine colors. The selected color shows up in a color choice bar. The blank squares can then be filled with the selected color simply by touching them. The object of the game is to fill all the blank squares, such that every column has one of each of the colors, and every row has one of each of the colors, and every major nine by nine square (shown by line borders...