This menu offers to you the following features :
Show Candidates
This asks Sudoktor to display all the possible candidates for each cell. If you have the "Show Candidates" function turned on, the pencil marks you have manually entered are simply ignored.
Analysis
This asks Sudoktor to display the cells where a candidate is necessarily true or false. Sudoktor takes in account your own pencil marks or the automatically displayed pencil marks if the "Show Candidates" option has been enabled. The software uses several powerful solving techniques to achieve this :
| 1. | Hidden and naked singles or tuplets. The cells have a yellow background when one single candidate is proved to be true. Simply point on the candidate in order to enter it. Or select the  smart button to enter the corresponding digit. The cells that contain hidden tuplets (pairs, triplets, quads...) are displayed with a light-green background. You can safely remove the non highlighted candidate(s). See sample. |
| 2. | Locked candidates. The cells, where one candidate is truly wrong, have a light-cyan background. To identify this candidate, have a look at the cells with a light-green background: it is the one which is highlighted with a yellow background. You can safely remove this candidate from the light-cyan cell(s). |
| 3. | Grid analysis. Same as for Locked candidates. See sample. |
| 4. | Almost Locked Sets. The cells where one (or more) candidate is truly wrong have a light-cyan background. To identify this candidate, have 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 this candidate from the light-cyan cell(s). See sample. |
| 5. | Strong chains. The cells where one candidate is proven to be wrong have a light-cyan background. To identify this candidate, have a look at the cells with a light-green background. You can safely remove this impossible candidate from the light-cyan cell. See sample. |
Note: 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.
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.