Is the "Impossible" level of play possible to solve without guessing? I don't see any listing of what the levels mean. In my view, if you have to make a guess and follow it through to see if it works, it is no longer a logic puzzle. I have run across this type and don't want to waste my time unless it is solvable without guessing. Thanks.
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That's why it's called impossible. It's impossible to solve logically. You have to guess. I added a note to the Sudoku homepage about that.
Sometimes, the impossible can become possible, if you're awesome!
Some links about solving sudokus:
* http://www.sudokusolver.co.uk - Sudoku Solver by logic
* http://www.scanraid.com/sudoku.htm - Sudoku Solver (Online, JavaScript)
* http://sourceforge.net/projects/tkpysudoku/ - Soduku solver in Python/TkInter
* https://sourceforge.net/projects/yasss - command line sudoku solver and generator
* https://sourceforge.net/projects/sudokut - command line Sudoku Solver (Tcl)
* https://sourceforge.net/projects/sudoku-sensei - Sudoku "explainer"
* http://www.csse.uwa.edu.au/~gordon/sudokumin.php - Minimum Sudoku: only 17 givens
-HaJo
-HaJo
We're all well aware of other sources. If you'd like to contribute some code or help integrate existing open source code into Sudoku Portable, great. Otherwise, please stop editing this post and making it show up as new.
Sometimes, the impossible can become possible, if you're awesome!