Welcome to DocSudoku. This solver should solve all puzzles that require use of any of the Simple Sudoku Technique Set (SSTS), that is:
It recognises most file formats out there for 3x3 sudoku (.msk, .sol, .sdk, .ss).
It will start analysing the puzzle after 15 numbers are filled in. The hinting algorithm will try to solve only as much as it has to in order to reveal a single candidate. It tries to eliminate candidates using the simplest algorithms first.
It does not support brute force/trial & error which means that if it solves a puzzle, a human being from planet Earth should manage it too.
Any comments/suggestions/job offers are welcome. Have fun spoiling your sudoku....