Single-step and ten-step are disabled, how do I enable them?

A. These functions are disabled whenever trial-and-error is an allowed solving technique. This is because, with trial-and-error enabled, the grid could be left in an incorrect state after the allowed number of steps. To enable the single and ten step functions, disable trial-and-error (Actions -> Solving Techniques -> Trial and Error.)

What People Say

I tried your software and really enjoy it. I really enjoy and make good use of your "Hint" facility, especially as a learning tool. As I approach my 79th birthday, my memory and learning abilities are in decline. Using your "Hint" tool, I can tackle the toughest puzzles and use them as teaching tools as I work through the hint. I am learning!
Jack Mudgett, California
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