Excellent! It stops me pulling my hair out when I can't find the wrong step that messed it up.
Final completion only. Does not show logic. My mistake, but I hoped for logical step-by-step explanations for the solution to each box.
Excellent I only use this when I'm totally stuck and it never fails. Re-another comment, logic tutorials are lengthy but can be found by doing a Google search.
Sudoku Solver Works perfectly. Source of much frustration relief!
- Chinese language