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I like SudokuExchange.com, also like SudokuSlam.com, though mostly I use Hodoku on my desktop.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.
Related posts
- Are there any specific Sudoku puzzles?
- In the circled area, there can be 2 possible triples(569 and 589) , how would I know which one's the right one? and why can't the other be chosen?
- What do I do here?
- What should I do in this situation, when there are multiple possibilities for every square? Should I just guess and see how it works out? Or is there a strategy to "guess it right"?
- When I feel stuck in an online Sudoku, I recreate it in Hodoku, to see what the next hint is (it has helped me learn some techniques so far) But this is a first!