What is a 4×4 sudoku?
A 4×4 sudoku is the smallest sudoku you can play. The grid has just sixteen little squares, split into four 2×2 boxes by slightly thicker lines. You only ever use the numbers 1, 2, 3 and 4. Some squares already have a number when the puzzle starts — your job is to fill in all the empty ones.
Even though the grid is tiny, it’s a real sudoku. Every puzzle has exactly one solution and you can always find it without guessing. The same logic kids use here is the same logic that grown-ups use on a full 9×9 grid — just with smaller numbers and a smaller board.
4×4 sudoku is the perfect first puzzle for little ones. Once it feels easy, the natural next step is our 6×6 sudoku grid, and then the full 9×9 sudoku game.
The three little rules
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Every row uses 1, 2, 3 and 4
A row is a line going across. Each row must have all four numbers, with no repeats. If a row already has a 2, you can’t put another 2 in that row.
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Every column uses 1, 2, 3 and 4
A column is a line going down. Same rule — every number once, no repeats. The numbers don’t have to be in order, just present.
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Every 2×2 box uses 1, 2, 3 and 4
See the slightly thicker lines? They split the grid into four little 2×2 boxes. Each box also needs every number once. Every square is part of one row, one column AND one box.
A really nice thing about 4×4 is that the rules are easy to spot in action. There are only four numbers and only sixteen squares, so a child can usually look at the whole grid in one glance. That makes the "aha!" moment come quickly.
How to play your first 4×4 puzzle
Tap any empty square. The square gets a yellow highlight, and the squares that share a row, column or box with it light up softly so you can see the constraints. Then tap one of the numbers 1, 2, 3 or 4 on the number pad. That’s it — the number drops into the square.
If you change your mind, tap the square again and tap a different number, or tap the Erase button (🧽) to clear it. There’s no buzzer and no penalty — sudoku is meant to be relaxing.
If you’re stuck, tap an empty square and then tap Hint (💡). The right number will appear. Try not to use it too often, but it’s a friendly safety net for new players.
Two tiny strategies
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Find the "missing one"
Any row, column or box with three numbers already in it has only one missing. Filling in those is the fastest way to start a 4×4 puzzle.
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Hunt one number at a time
Pick a number, like 3. Look at the four rows in turn. If a row is missing a 3, see which empty squares it could go in (remember to check the columns and boxes too). Often there’s only one possible spot — fill it in.
Why 4×4 sudoku is great for little kids
- 🔢 Practises the numbers 1–4 in a fun, no-pressure way.
- 👀 Builds focus and "look before you act" patience.
- 🧠 Introduces logical thinking — the same skill used in early reading and maths.
- ✨ Gives a real "I did it!" feeling once the grid is full.
- ⏱️ Short enough to fit between dinner and bedtime.
- 👨👧 Perfect for a grown-up and child to do together.
Many parents find that 4×4 sudoku is one of the few "screen activities" that doesn’t leave their child feeling buzzy or overstimulated. There’s no soundtrack, no flashing rewards, no popups. Just a small puzzle to look at and think about. Some families have a "puzzle before bed" routine — a single 4×4 grid only takes a minute or two and helps wind down the day.
Teachers, too, often use 4×4 puzzles as a gentle warm-up at the start of a maths lesson. Even children who don’t love arithmetic usually enjoy them, because they don’t involve adding or counting — just spotting which number is missing.
Tips for grown-ups playing along
- 🤐 Resist the urge to point at the answer. Ask "which row is missing a 3?" instead of saying "put a 3 there".
- 🎉 Celebrate the first finished grid loudly. The "I did it!" feeling is what brings them back tomorrow.
- 🐢 Let them go slowly. Speed is not the goal at age 5.
- 🔁 If they get a wrong answer, just say "try another number" — no need to make a big deal of it.
- 📵 Play offline — once the page has loaded once, the game works without an internet connection.
Ready for a bigger grid?
Once your child is finishing 4×4 puzzles in a couple of minutes, try our 6×6 sudoku grid. It uses the numbers 1–6 and has 2×3 boxes — a friendly stepping stone to the full 9×9 game. Most kids who can comfortably do 4×4 are ready for 6×6 within a week or two of practice.
When 6×6 also feels easy, the full 9×9 sudoku game on the main page is the next adventure. Easy 9×9 puzzles are a bigger step up than 6×6 — but if a child has loved 4×4 and 6×6, they’re usually ready by age 7 or 8.
Frequently asked questions
What age is 4×4 sudoku good for?
Most children can enjoy a 4×4 sudoku from age 4 or 5, as soon as they recognise the numbers 1, 2, 3 and 4. There’s no maths involved — just spotting which number is missing.
Are these puzzles really suitable for a 5-year-old?
Yes. Each puzzle has only eight empty squares, the rules are tiny, and big tap targets make it easy on a phone or tablet. Most 5-year-olds finish their first one in under five minutes.
How long does a 4×4 sudoku take?
Two to five minutes for a new player. Once a child is comfortable with the rules they often solve one in under a minute.
Do I need an account?
Nope. No signup, no email, no ads getting in the way. The page works straight from your browser, on phones, tablets, laptops and at the kitchen table.
Can I print 4×4 sudoku puzzles for school?
Printable sheets are coming soon. For now the on-screen game works great on classroom interactive whiteboards and tablets.
Is 4×4 too easy for a 7 year old?
Often, yes — most 7 year olds will solve a 4×4 in under a minute and want a bigger challenge. Try our 6×6 grid, or jump straight into Easy 9×9 sudoku.
My child gets the rules but not the strategy. Help?
Sit beside them and ask "which row is missing a 3?" rather than pointing at the answer. The "missing-one" strategy clicks for almost every child after a few games.
Where next?
Once these feel easy, step up to a bigger grid.