The Sudoku Susser makes it easy to make your selections as you solve the puzzle; just click on one of them and select the new number from the popup menu that appears, or mouse over it and press the number on the keyboard. But it does far more than that! If you make a mistake and enter an invalid move, the Susser will hilight the invalid squares in red. If you'd like some extra help keeping track of what's what, checking Show Hints will display all the remaining possibilities in the empty squares.

If you want help with a puzzle, the Deduce! button will apply a list of increasingly sophisticated techniques in order to progress. Sudoku Susser can solve all know sudokus by logic, using only techniques that human players would reasonably be able to execute (though a couple are ones that only a Sudoku maniac would try to use). Each step in the solving process is explained in detail. You can single-step, and you can brute-force recurse to get the solution. You can also ask the Susser to give you a hint about what method needs to be used next, and where you need to use it. With the addition of the “Trebor's Tables” deduction algorithm, the Susser can now logically deduce the solution to the most difficult known Sudoku puzzles.

Other features:

• You can drag Sudoku graphics from just about any webpage and they'll be scanned and loaded into the application
• Instant download of new puzzles from the Menneske.no Sudoku archive
• Extensive help, hint and hilighting features show you the logical structures in the puzzles
• You can manage, rename, reorder, and print out your Sudokus
• You can drag them out of the app as graphics or in a variety of text formats
• Undo and redo are fully supported
• Many sample puzzles to get you started
• Comprehensive manual gives detailed explanations of all the advanced solving methods the program can use