How to play

Place digits 1–9 so each row, column, and 3×3 box contains every number exactly once. Every puzzle is logic-solvable without guessing. Killer adds cage sums; X-Diagonal adds two main diagonals as extra constraint lines.

Read the complete Sudoku rules

Features

Three variants: Classic 9×9, Killer cages, X-Diagonal
10 difficulty levels — Beginner to Grandmaster
Daily Challenge with 7-day streak calendar
Casual Race: two players, same puzzle, first to finish wins
Technique-based hints — logic solver, never guesses

Sudoku guides

Rules

How to Play Sudoku

The complete Sudoku rule set, including Killer cages and X-Diagonal lines, with a worked example of solving a cell.

Strategy

Sudoku Strategy Guide

Sudoku solving techniques from naked singles to X-Wings and chains, plus how to use the 10 difficulty levels to improve.

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