The main menu "Options" offers the following options which are saved when the Sudoku program is closed:
Track: If checked, the program displays the solving process.
Find all Solutions: If more than one solution is possible for the current problem the program calculates all solutions. When finished, the first 100 solutions can be examined using the "<"-button or ">"-button respectively.
Show Possible Values: If checked, the grid contains "Watch Hand" hints.
Auto Check: If checked, the program checks whether or not the resulting problem is still solvable after keying in a new value.
Mark Neighbors: If checked, the neighbors of the current cell are highlighted with a different color.
In addition this menu offers two entries to control the solving time:
Pause: The solving timer is stopped until the next value is entered or changed.