| 1 | Hidden and naked singles or tuplets. The cells have a yellow background when one single candidate is forced to be true. Simply point on the candidate in order to enter it. Or select the  smart button to enter the corresponding digit.
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| 2 | Locked candidates. The cells, where one candidate is forced to be false, have a light-cyan background. To identify this candidate, look at the cells with a light-green background: it is the one which is highlighted with a yellow background. You can safely remove the candidate from the light-cyan cell(s).
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| 3 | Grid analysis. Same as for Locked candidates.
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| 4 | Almost Locked Sets. The cells, where one (or more) candidate is forced to be false, have a light-cyan background. To identify this candidate, look at the cells with a light-purple or light-pink background: the candidate is highlighted with a small yellow background. You can safely remove the candidate from the light-cyan cell(s).
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| 5 | Strong chains. The cells, where one candidate is forced to be false, have a light-cyan background. To identify this candidate, look at the cells with a light-green background. You can safely remove the impossible candidate from the light-cyan cell. See sample.
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| Type a letter to display the desired chain. For example, [A] will display the first chain. [C] the third chain, etc. [Z] will display all strong chains. Note that chain nodes are displayed with a circled or rectangular background following their parity.
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To remove the false candidates, you can use the
smart button.
The Demo version uses only one of the advanced algorithms at a time. You can select this one with {Show -> Analysis Options}.
Solution
This commands asks Sudoktor to show the solution. Tap or click anywhere on the screen to restore the board.
Wrong Values
This commands asks Sudoktor to highlight the cells containing wrong values with a red background.