You can enter a Sudoku in just about any way you can think of --
as a straight line of digits, a block of digits containing periods, question marks, dashes, or underlines,
even as tables showing all possibilities.
Spaces are ignored.
return to standard view
You can also load a set of puzzles, either from your own data (81 numbers per line)
or from one of the following challenging collections:
The following links give some hint of the difficulty of these collections: top95 methods catalog and
top1464 almost-locked sets analysis
recalculate strong edges
color strong chains
remaining cells only
(It can take a few seconds for the model to load the first time.
Some Macintoshes may not be able to display the 3D model.)
Open in Andrew Stuart's solver
for the Sudoku communityby Bob Hanson
Sudoku Programmer Forum
Sudoku Players Forum
Glenn Fowler, ATT Research
Ruud van der Werf