Sudoku Hot is a free sudoku puzzle game and a focused place to play Sudoku puzzles in your browser—classic 9×9 grids, a calm UI, and quick access to daily Sudoku, hard Sudoku, expert Sudoku.
Start a new classic Sudoku puzzle instantly—no sign-up.
Beginner-friendly puzzles with more clues and direct logical steps.
Balanced puzzles for practicing candidates, singles, and pairs.
Fewer givens, sharper deduction—practice advanced logic.
High difficulty puzzles designed for experienced solvers.
One featured puzzle per day, with a gentle streak calendar.
Enter any classic 9×9 puzzle and fill it with a valid solution.
Learn the row, column, and 3×3 box rules with a beginner guide.
Prefer paper? Generate printable Sudoku sheets with custom difficulty and layout.
Create printable puzzlesKiller Sudoku combines classic Sudoku rules with cage sums. If you’re curious, our guide explains the rules and shows examples.
Learn Killer Sudoku rulesSudoku Hot lets you play Sudoku online instantly: choose a difficulty, fill the 9×9 grid so each row, column, and 3×3 box contains digits 1–9 once, and use notes or hints when you need support. No install is required.
Start on Easy to practice scanning for singles. Move to Medium when you can finish Easy without guessing. Hard and Expert teach longer elimination chains; Master is for solvers who enjoy sparse clue sets.
If you prefer a shared ritual, open Daily Challenge for one featured puzzle each day. If you teach or travel, generate printable Sudoku sheets and keep solutions on a separate page.
Higher difficulty usually means fewer given digits and more advanced techniques. Exact clue counts vary by puzzle, but the progression is designed so you can step up when ready instead of grinding unlocks.
Yes. You can play classic Sudoku, daily challenges, and Hell Mode Killer puzzles in the browser without paying to unlock difficulties.
Yes. Open Play and choose Hard, Expert, or Master—or jump from this page’s hard and expert cards.
Yes. The print studio creates multi-puzzle sheets with layout, difficulty, optional solutions, and QR codes.
Fill a 9×9 grid so every row, column, and 3×3 box contains each digit from 1 to 9 exactly once. Use the given clues and eliminate impossibilities until only one digit remains for each empty cell.
Easy Sudoku puzzles start with more given digits and leave fewer cells to solve. Hard puzzles have fewer clues and usually require techniques such as hidden singles, pairs, and longer elimination chains.
No. Sudoku Hot runs in your browser on phone, tablet, or desktop. Progress and preferences can stay on your device without creating an account.
Notes are small candidate digits you write in a cell while you still have more than one possibility. They help track options until logic proves which digit belongs there.
You can enter any digit, but high-quality Sudoku puzzles are designed to be solved by pure logic. Guessing often creates contradictions later and trains weaker habits.
Killer Sudoku keeps classic row, column, and box rules, then adds cages with sum clues. Digits inside a cage must add to the clue and cannot repeat inside that cage.