Sudoku Uno 1.0

"Sudoku Uno" is an elegant implementation of the popular Sudoku game. It's pleasing interface wraps an extensive feature set that makes "Sudoku Uno" stand out of the crowd.
"Sudoku Uno" provides an almost infinite number of Sudoku games categorized in 3 levels of difficulty.

Its powerful engine is also able to provide intelligent hints: the engine may explain the reasoning behind the hint.
Features:
- Three levels of difficulty: easy, medium, hard
- Difficulty levels are determined by techniques to master, not by number of givens
- Unlimited number of Sudoku games
- Green & red pencil notes
- Optional automatic pencil notes (*)
- Optional blocking of erroneous entries
- Intelligent hints with explanations
- High scores