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From carl nohre:
When you focus on sudoku, your brain will relax from other problems!This app contains 66 carefully selected and tested sudokus. Their difficulty has been ranked "level 3", which means that they are rather challenging (see the developer's page for more info). The user interface is simple, intuitive, and elegant!The App is ad-free. It has no battery consuming network connections. If you plan to spend time on solving sudokus, you should buy this very affordable app!Features:* Unlimited number of moves can be undone (undo / redo)* Sudoku Library that shows which problems you have solved and still have to solve! One can have several ongoing sudoku!* Eye Capture. You can highlight any digit (for example, all 3's)* Pencil marks