Colorful Sudoku

Colorful Sudoku is similar game to classic Sudoku but with colors instead of boring numbers and simpler.
The idea is to color all the grid. And the only rule is to use different colors in every column and row (Classic Sudoku has more requirements).
Initial levels are very easy and may be a great fun for the young ones.
Game may be used by parents and teachers to improve the logical thinking of the children as well as brain training for everyone.