I've entered a few pencil marks, and now Sudoku won't find the solution - why not?

A. The built-in solver uses the same pencil marks as you do. This is so you can assist the solver if it gets stuck, but it means the solver will never add pencil marks to a cell if there are some already present - otherwise it could undo eliminations made because of your superior logic. The downside of this, is that if you enter any pencil-marks into a cell, you need to enter all of them. The easiest way to do this is with the "automatic-pencil-mark" button. If any cell contains incomplete (or incorrect) pencil marks, the solver may not be able to find the solution.

What People Say

Well, I love SuDoku, and I collect SuDoku games—especially on my PalmOS-based Zire72... but I have several other WindowsXP-based SuDoku games too, and I feel that I must say about your game that I am impressed! Thanks for a well-written SuDoku program. (And, yes well, I really don't know why I collect different SuDoku programs; they each have their strengths and weaknesses, I guess, and I suppose in the future I will settle for using one in particular. But I find that I often turn to YOUR version, when I wish to just play a quick round, or explore the differences between the easier and the more difficult or expertly-rated puzzles. I appreciate ease-of-number entry when I want to concentrate on playing, rather than program mechanics!)
Mark Seven Smith, California
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