Fair Sudoku Makes the Logic Part of Sudoku Explicit

Why it surfaced

Fair Sudoku turns a familiar puzzle into a small lesson in proof. Its three-stage hint system reveals the next move, the evidence behind it, and the reasoning only as needed, while a visible fairness certificate records that no guesses were required.

A Sudoku game that certifies each puzzle can be solved by step-by-step logic at the player’s chosen level, without guessing or ads.