I usually play with notes on my iPhone app but I really like sudoku (even if I can't spell it without looking it up LOL), so I'd like to be able to do it note-less.

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Sudoku

Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid (also called "boxes", "blocks", "regions", or "sub-squares") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which typically has a unique solution.

This description uses material from the Wikipedia article on Sudoku and is licensed under the Creative Commons Attribution-ShareAlike License (view authors).