🧩 Sudoku Hard

<p>Fewer clues, deeper deduction — this harder Sudoku rewards candidate-tracking and patient elimination. Sudoku Hard is the world's favourite number-logic puzzle: fill the 9×9 grid so every row, column and 3×3 box holds 1 to 9. Under the surface it's quietly training pure logic, scanning and candidate elimination. Because every session is brief but begs for 'just one more go', it's become a reliable daily habit for puzzle lovers. It's built for players everywhere, with crisp controls and clean visuals that feel at home from New York to London to Sydney. Just open it and play: no apps, no accounts, no waiting, on mobile and desktop alike. There are no timers forcing you to rush unless the game itself adds one, so you can play at your own thoughtful pace. Controls are dead simple to learn but the depth keeps revealing itself the more you play. It sits comfortably alongside the other thinky games in our collection if you fancy a change of pace. Your best result is saved locally, so each visit you're really racing the toughest opponent of all — yourself.</p>

How to play

• Tap an empty cell to select it.
• Choose a number from the pad or press 1–9 on the keyboard.
• Each digit can appear only once per row, column and 3×3 box.
• Use elimination to narrow each cell to one option.
• Fill every cell correctly to finish.

Controls

Tap a cell to select it, then tap a number pad button or press 1–9 to fill it. Wrong entries are highlighted.

Features

• Freshly generated, uniquely solvable boards
• Difficulty set by how many clues you start with
• Instant feedback on incorrect digits
• Timer and best-time tracking

FAQ