SuDotKu
A Sudoku game by Ober Games.
About SuDotKu
SuDotKu lets you play Sudoku puzzles in 4×4 and 9×9 sizes, with 16×16 and 25×25 sizes also available with Premium.
The game provides four difficulty levels: Easy, Normal, Hard and Killer. It also includes candidate notes, validation tokens, scoring and statistics.