Directions:
Right click on a square to add or remove a number. In addition, a square may be marked as hidden by placing an 'X' there. This is useful when you need some solving help, but don't want to know the entire solution. To solve, press the 'Pass Move' button on the toolbar or select it from the 'Play' menu.

Sudoku Solver - Highlighted (Variant):
This provides an additional set of yellow numbers in order to distinguish between numbers that are part of the puzzle and numbers which are part of the solution. However, due to the additional choices, puzzle entry may take a bit longer.

Tips:
Sudoku Solver can be used to solve any valid partially completed puzzle. It will even tell you if a completed puzzle is correct. If the puzzle cannot be solved because it is invalid, the solver will attempt to indicate so. If you decide to stop the solver by using 'Move Now', you may continue editing the puzzle.

Use 'Save Game As...' for saving partially completed puzzles prior to solving them since you cannot continue playing with the puzzle further once 'Pass Move' has been selected and the solver has completed.

There is a sample directory containing some setups. See the ReadMe.txt file for further information.