Sudoku Solver · Solve & Learn

About this app

Sudoku Solver is the complete companion for sudoku enthusiasts — whether you want to crack a tough puzzle, sharpen your technique, or simply understand how each solution was reached. Enter any 9x9 grid by hand, tap Solve, and watch constraint propagation and backtracking work through the board in an instant. Stumped mid-puzzle? Use the step-by-step deduction mode to reveal one logical move at a time, each labelled with the technique name — Naked Single, Hidden Single, Pointing Pair, X-Wing, and more — so you actually learn the reasoning behind every step. Conflict highlighting marks duplicate digits in red as you type, catching input errors before you solve. Pencil marks let you note candidate digits in any cell, just like pencil-and-paper play. A built-in difficulty rater analyses the techniques required and rates your puzzle from Easy to Expert. Jump-start your session with the included library of sample puzzles spanning every difficulty level. The technique glossary explains each solving strategy in plain language, making Sudoku Solver as educational as it is practical. Key features: - Instant solve via constraint propagation and backtracking - Step-by-step deduction with named technique labels - Real-time conflict highlighting - Pencil-mark candidate notation - Automatic difficulty rating (Easy to Expert) - Sample puzzle library across all difficulty levels - Technique glossary for learning and reference - Clean, distraction-free grid interface

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1. First observed Aug 20, 2026 · 9:21 PM Free