But, there is nothing in the Sudoku to shortcut the mental process required to complete it. There are aids to help with some of the legwork though, the Sudoku will auto fill and update pencil marks showing all of the possible numbers available in each square and you can highlight all squares that can hold a possible number allowing patterns to be seen. The 9x9 Sudoku come in four levels of difficulty with the most difficult requiring slightly harder solving techniques than the larger puzzles. There are no cheats or hints to allow you to carry on if you get stuck. And if you complete one you will have solved it. These are Sudoku that will take a bit of time to solve. The Samurai and Super Sudokus come in three levels of difficulty, none of them are trivial or easy.
And now an unlimited supply of automatically generated 9 x 9 Sudokus for when you want a quick puzzle. For those that want a puzzle that lasts more than a few minutes.
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