Sudoku
Fill the grid so every row, column and box has each number exactly once. Every puzzle has one answer, and you never need to guess.
How to play
- Fill every square with a number from 1 to 6.
- Each row, each column, and each bold 2×3 box has every number exactly once.
- Tap a square, then tap a number. Tap any filled square to light up every matching number.
Four levels: pick your heat
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Mild
Find a row, column, or box that’s almost full and work out the number it’s missing.
With Tan the Turtle. Play today's Mild Sudoku →
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Medium
Find a row, column, or box that’s almost full and work out the number it’s missing.
With Digit the Fox. Play today's Medium Sudoku →
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Spicy
Use Notes to list what could go in each square. If a number can only go in one row of a box, it can’t go anywhere else in that row.
With Blaze the Dragon. Play today's Spicy Sudoku →
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Extra Spicy
Use Notes, and hunt for hidden pairs: if two numbers can only go in the same two squares of a row, column or box, those two squares can’t be anything else.
With Pi the Owl. Play today's Extra Spicy Sudoku →
What math it practices
- Logical reasoning
- Elimination and pattern spotting
- Persistence and checking work
Best for All ages, and fun for grown-ups too. Every level has its own daily leaderboard, and solving any puzzle on its day keeps your streak going.
Questions
Is there an easy Sudoku for beginners?
Yes. Mild is a 6×6 grid with 2×3 boxes and plenty of clues — a great first Sudoku. The 9×9 levels add harder logic step by step.
Is it free? Do I need an account?
Free, with no sign-up. Every visitor gets a guest name like Mathlete4821. The site never asks for a name, email or age.
What do the peppers mean?
There are four levels: Mild 🌶️ (warm up), Medium 🌶️🌶️, Spicy 🌶️🌶️🌶️ and Extra Spicy 🌶️🌶️🌶️🌶️ (big-brain challenge). Play any level, or all four, every day. Each level has its own leaderboard.
When is there a new puzzle?
Every day at midnight Pacific time. Missed a day? Past puzzles stay playable.
Can teachers use it in class?
Yes. The puzzles make a quick warm-up or a challenge for early finishers, and they work on phones, tablets, Chromebooks and the classroom screen.