Corrected Bug: The version 18.104.22.168 might be faster than all of the others, but unfortunately under some circumstances it crashes when creating new problems. This has been fixed (without slowing down the application excessively).
New feature: Some really convincing performance improvements for generating new problems.
New feature: Besides the "Watch Hand Method" it is now possible to show and print both possible values and candidates as digits.
New feature: Some performance improvements for generating new problems (unfortunately this function is still not really fast, a redesign might be necessary to calculate new problems much faster).
New feature: New option to add a comment for the current Sudoku problem. This comment is printed out below the problem.