Casual Games

Sudoku

Put 1 to 9 once in every row, column and box!

Sudoku is the world-famous number puzzle played on a 9×9 grid. Every row, every column and every bold 3×3 box holds the numbers 1 to 9 exactly once. Chalna's Sudoku makes a brand-new puzzle with a single answer every time you play.

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No install, no sign-up — starts right away

At a glance

Players: 1
Ages: 8+
Play time: About 5–20 min per game
Levels · Modes: 2 levels (Normal: 34 givens / Hard: 26 givens; 3 hints per puzzle)

How to play

Choose Normal or Hard.
Tap an empty square, then tap a number on the keypad.
Avoid repeating a number in any row, column or box. Use Notes to jot down candidates in tricky squares.
Fill all 81 squares correctly to finish.

Tips

Start with the rows or boxes that are nearly full — the missing numbers are easier to find.
Pick one number and look for every place it can go. The small figure under each key shows how many of that number are left.
Turn on Notes to write candidates. When you place a correct number, matching notes in the same row, column and box disappear automatically.

What it practices

Logical thinkingFind each answer step by step from sure clues.

FocusKeep track of several rows and boxes at once.

Working memoryHold candidates in mind and narrow them down.

Great for

Anyone who enjoys quiet thinking time
Seniors who love newspaper puzzles
First-timers trying logic puzzles

Good to know

Wrong numbers turn red and add to your mistake count, but the game keeps going. A row, column or box sparkles when it is complete, and the results show your time, mistakes and hints used.

Sudoku · Play now →