Simple Sudoku is a portable freeware app that makes high-quality, symmetrical puzzles, have a single solution, and do not require trial & error to solve.

The user can also choose between five levels of complexity - from Easy to Extreme. Each puzzle is generated randomly, so there is an almost limitless selection.

Simple Sudoku also provides tools to help solve difficult puzzles - removing the drudgery but not the fun. Keeping track of possible values for blank cells (candidates), providing filters, and color markers are just some of the tools available to make solving even those tricky puzzles possible.

If you ever get stuck, Simple Sudoku can get you started again with a discreet hint.