Four Winds - Uorurojikku

Do you know Japanese puzzle game - Uorurojikku? It's Sudoku's younger brother. Very addictive, very challenging and giving a lot of fun. It is the only Uorurojikku app in the Google Play Store. In English it's called Four Wind, which stands for four directions, in which the color can smudged. Fill the whole board with colors and level up!