Sudoku
from the little dragon

Xiaolong is Chinese for “little dragon”. Classic 9×9 sudoku — or, if you like, with the characters 一–九 instead of digits.

Soon

No adsNo banners, no videos between games

FreeNo purchases, no subscriptions, no paid levels

One solutionEvery puzzle has exactly one — no guessing

LevelMedium

Time0:00

Mistakes0

←↑→↓ cell1–9 digitN notesCtrl Z undo

New game

Level = the hardest technique you’ll need

Features

Like a good puzzle book, but the pencil never goes blunt

Pencil notes

Jot down candidates yourself or turn on auto-notes. When you place a digit, it drops out of the neighbouring notes on its own.

Pencil in the digits a cell could hold
Place a 7 where it definitely goes
The 7s vanish from notes in that row, column and box

Mistakes, your way

Flag them instantly, only on request, or not at all. No “three strikes and you’re out” unless you want it.

Close it and pick up on the same move

Your game is saved after every move, even if the phone drops the app from memory.

Five levels

We rate difficulty by the hardest technique you’ll need, not by how many cells are empty.

Easy

Medium

Hard

Expert

Master

Dark theme

For a game before bed. Or let it follow your system.

An honest result

After each game: time, mistakes and hints. If the timer stresses you out, hide it.

12:36time

0mistakes

0hints

一二三 mode

Characters instead of digits

For anyone learning Chinese. Same puzzles, but the board shows 一–九 instead of 1–9 and the keys carry the pinyin. A couple of games and you’ll never mix up 六 and 八 again.

1一yīone stroke
2二èrtwo strokes
3三sānthree strokes
4四sìa window with a curtain
5五wǔa cross with a shelf
6六liùa house with a roof
7七qīan upside-down 7
8八bātwo legs apart
9九jiǔa hook, like a 9

小龙 means “little dragon”. It’s the name of the Chinese language school that made this app.

The app

How it looks on your phone

Sudoku without ads. Nothing between you and the game — Sudoku without ads
Nothing between you and the game

Five levels of difficulty. From a 5-minute warm-up to a master game — Five levels of difficulty
From a 5-minute warm-up to a master game

Numbers in Chinese. Same rules — the characters stick on their own — Numbers in Chinese
Same rules — the characters stick on their own

Your game is waiting. Take a break any time — Your game is waiting
Take a break any time

Solved!. Time, mistakes and hints at a glance — Solved!
Time, mistakes and hints at a glance

Before you download

Questions and answers

Didn’t find your question? Write to us — we answer ourselves, no bots or templates.

Contact support

How do you play sudoku?

Fill the empty cells with digits 1 to 9 so that none repeats in a row, a column or a 3×3 box. A few digits are already in place — that’s where you start.

What does it cost, and are there ads?

Nothing, and no. There are no paid levels, no subscription and no banners between games, and we don’t plan to add any.

Do I need the internet or an account?

No. You can play on a plane and without signing up. An account only helps if you want to carry on on another device — say, start on your phone and finish on a tablet: you sign in with a code from an email, no password to invent.

How is Master different from Easy?

Not by the number of empty cells, but by how you have to think. Easy needs only simple techniques; Master calls for the trickiest ones. Every puzzle still has a single answer, so you never have to guess.

Why characters instead of digits?

It’s a mode for people learning Chinese. The board shows 一–九 instead of 1–9 and the keys carry the pinyin. The rules don’t change, and after a few games you read the characters without help. Switch it on or off any time.

Can I play right on the site?

Yes, right here. An unfinished game is saved in your browser, so you can close the tab and come back later.

When is the app coming out?

We’re getting it ready for the App Store, Google Play and RuStore. Once it’s live, the buttons on this page will turn into links.

How do I delete my account?

In the app: Settings → Account → Delete. No access to the app? Send a request on the site — we’ll delete it within 30 days.