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Ages 4–12 · Pure numbers

Sudoku Junior.
The sudoku that explains itself.

Sudoku Junior doesn't just check an answer — it teaches the thinking behind it. Hints dim the board to the exact row, column, or piece that decides a square, so kids take the last step themselves. Five board types to grow into, 4×4 to 12×12 plus a new Jigsaw mode, with Sudoku School to explain it all. Never a timer, no losing, no ads.

Get the app on

Coming soon to the App Store Get it on Google Play
  • Fully offline — planes and car rides included
  • No ads, ever
  • One unlock, shared with the whole family
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Why kids (and parents) like it

Real sudoku, sized for little kids

Hints that explain, not just check

Stuck on a square? The board dims to the exact row, column, or piece that decides it, and a hint explains why — kids take the final tap themselves. It's a sudoku tutor, not just an answer checker.

Sudoku School

Five short, illustrated sections: sudoku's real history (Euler, the 1979 puzzle magazine, Nikoli's 1984 reinvention, the 2004 newspaper craze), the rules on live mini boards, three named solving tricks, a Jigsaw intro, and an app tour — each with its own progress.

Jigsaw Sudoku, all-new

One 122-level journey where irregular puzzle pieces replace the usual boxes. Boards grow from a gentle 4×4 through 5×5 and 6×6 to a 7×7 finale.

Five kinds of boards that grow with them

The classic ladder runs 4×4, 6×6, 9×9, and 12×12. For kids who can't read numerals yet, a dots mode swaps digits for countable dice dots — sudoku for four-year-olds, no reading required.

21 badges, up to four kids

Drawn badge icons track what each child has learned and solved. Up to four children share one device, each with their own avatar — 8 symbols in 8 colors — and their own separate progress.

Gentle by design, transparent for parents

No timers, no lives, no fail states, no ads. A parent report totals time played, puzzles solved, and tricks learned — computed entirely on the device, never sent anywhere.

How it works

Three steps, zero frustration

  1. Pick a level on the map

    Each board size has its own journey. The next level is always obvious — young kids can start a 4×4 without reading a word.

  2. Tap a cell, tap a number

    That's the whole input. Every row, column, and box needs each number exactly once. Hints, undo, and the eraser are right there when needed.

  3. Celebrate and move on

    A calm, happy celebration marks every finished puzzle, and the map advances. No score pressure, no countdowns — just the next adventure.

Screenshots

A first look

Real captures, straight from the app.

  • A Jigsaw Sudoku board mid-solve, with bold irregular puzzle-piece outlines replacing the usual square boxes.

    Jigsaw Sudoku in play

  • A sudoku board in dots mode, showing each number as a pattern of countable dice dots instead of a numeral.

    Dots mode for pre-readers

  • The chaptered level grid, levels grouped by chapter with small dots marking each level's difficulty.

    The level grid

Pricing

Try every board size free. One unlock for everything.

There are no ads and nothing else to buy — ever. Kids sample the first levels of every board free — 59 of 350, Jigsaw included; a single purchase, behind the parental gate, unlocks the rest for the whole family.

Free

Every kid starts here

  • The first levels of every board — classic sizes and Jigsaw (59 of 350 puzzles)
  • Every guided tutorial
  • Three free hints per level, undo, eraser, and pencil marks
  • Full offline play

Unlock everything

Once — for the whole family

  • All 350 levels across every board size
  • One-time purchase — no subscription, no coins, no consumables
  • Family Sharing: one purchase covers the household
  • Restorable on any new device

Privacy, for parents

Made for kids means built like it

  • No ads, no ad networks — not "family-friendly ads", none at all
  • No accounts, no sign-in, no chat, no personal data collected
  • Progress lives on the device; gameplay never touches the network
  • Crash and usage reporting is COPPA-configured, with a parent opt-out in the Parents Hub
  • Purchases, settings, and every external link sit behind a parental gate

The full details live in our privacy policy.

FAQ

Questions parents ask

What ages is Sudoku Junior for?

Ages 4–12. Four-year-olds can start before they even read numbers, using dots mode on a guided 4×4 board; older kids grow into 6×6, the classic 9×9 with pencil marks, a 12×12 expert tier, and the new Jigsaw mode with its own irregular boards.

Are there really no ads?

Really none. The app contains no ad networks of any kind — not even "kid-safe" ones. It earns its keep through a single optional one-time unlock purchase instead.

Does it work offline?

Yes — 100% of gameplay works in airplane mode. Every puzzle ships inside the app, and progress is stored on the device. Planes, road trips, and dead zones are exactly what it's built for.

What does the one-time purchase include?

Everything: all levels on every board, forever. It's a single non-consumable purchase, with Family Sharing enabled — no subscription, no coins, no follow-up paywalls. The first levels of every board stay free (59 of 350 puzzles) so kids can try before you buy.

Is my kid's data safe?

The app collects no personal information: no accounts, no names, no photos, no location, no ad identifiers. Crash and usage reporting is configured for children's-privacy compliance (COPPA), and parents can switch it off entirely from the gated Parents Hub.

Can my kid buy something by accident?

No. The only purchase in the app sits behind a parental gate — a fresh adults-only math challenge every time — and payment still goes through the App Store or Google Play with your device's normal purchase confirmation on top.