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!
•Levels designed exclusively for this app
•150 levels (so far)
•Japanese themed design
•Unlocking packages with collected stars (it's totally free!)
•Italian (thanks, giacomo909090!)
If you want this app to be translated to your native language, you can contribute at