🧩 Sudoku
Fill the 9×9 grid so every row, column, and 3×3 box contains 1–9.
About Sudoku
Sudoku is one of the world's most popular logic puzzles. The 9×9 grid needs to be filled so that every row, column, and 3×3 box contains each digit from 1 to 9 exactly once. No arithmetic involved — just pure logical deduction, elimination, and pattern recognition. Satisfying to solve, genuinely challenging as the difficulty increases.
This version includes multiple difficulty levels, an undo button, hint assistance, and instant error checking so you know right away if a placement is incorrect. Play on desktop or mobile whenever you want a focused mental challenge that fits into a coffee break — each puzzle has a unique solution and can be completed in 10–30 minutes depending on difficulty.