Online logic game

Mini Sudoku: 4×4, then 6×6 against the clock

Also known as: 4x4 sudoku, 6x6 sudoku, small sudoku online, sudoku for beginners

Fill in the empty cells so that no digit repeats in any row, column or block. The first puzzles are small, 4×4, and then the grid grows to 6×6. A round lasts two minutes, and you can play 10 minutes a day without signing up.

Go to the game ↓

2 minutesper round
4×4 → 6×6the grid grows
No sign-up10 minutes a day
Progress30-day chart

What it trains

Why solve small sudoku

Sudoku is a puzzle of step-by-step deduction: the row, column and block leave only one possible digit. Small grids take about a minute, so in one round you get through several puzzles and can feel yourself getting faster.

Every puzzle is generated fresh and checked to have exactly one solution. Once you sign up, your account shows your score, the number of sudoku solved and your mistakes.

A full sudoku feels too longHere the grid is 4×4 or 6×6
You want to learn sudoku from scratchThe start is really easy
You put in digits at randomA mistake costs a point
You like calm puzzlesOne timer for the round, no rush on each move

Logical deduction

A digit goes in once the others are ruled out.

Attention to detail

You need to check the row, the column and the block.

Working memory

You keep the candidates for a cell in your head.

Planning

It pays to start with the cells that have the fewest options.

Rules

How to play

Start
Press “Start”. A 4×4 sudoku appears: every row, column and 2×2 block must contain the digits 1 to 4.
Pick a cell
Tap an empty cell. Its row, column and block are highlighted.
Digit
Tap a digit below the grid or type it on the keyboard. A correct digit stays; a wrong one flashes red and disappears.
New grid
Solve it and the next sudoku appears. After two 4×4 grids come 6×6 grids with 2×3 blocks, and there are more empty cells.
Score
Correct digit: 1 point on a 4×4 grid and 2 on a 6×6. A solved grid gives a bonus of 3 or 8 points. A mistake costs a point.

Play online

Mini sudoku online

Fill the grid with digits and no repeats. Without signing up you get 10 minutes of play a day.

Mini Sudoku

Fill the grid with digits so none repeats in a row, column or box. First 4×4, then 6×6. Every grid has exactly one solution.

Free play left today without signing up: 10 min

Method

What the exercise is based on

The rules are the same as in classic 9×9 sudoku, only the grid is smaller: 4×4 with 2×2 blocks and 6×6 with 2×3 blocks. Puzzles are built from a random filled grid, and digits are removed as long as the solution stays unique.

If you’d like another timed logic puzzle, try Tower or Patterns.

4×4Warm-upTwo 4×4 grids with 6 to 9 empty cells

6×6Bigger gridDigits 1 to 6, 2×3 blocks, 14 empty cells

up to 24Fewer cluesEach solved grid has more empty cells

Who it’s for

Which ages

Adults

Two minutes of calm logic. A good fit if you’ve long wanted to start doing sudoku.

Kids

Suitable from age 6 if your child knows the digits up to 6: for kids there are more 4×4 grids and fewer empty cells.

60+

A calm puzzle with no rush on each move: one timer covers the whole round, and you can fix a mistake right away.

Questions

Frequently asked questions

What happens if I enter a wrong digit?

It flashes red and disappears, and one point is taken off your score. You can try another digit right away.

Can a puzzle have two solutions?

No. Every grid is checked when it’s created: it has exactly one solution.

Can I play with the keyboard?

Yes: the arrow keys select a cell and the number keys enter the answer.

Do I need to sign up?

No, you can play 10 minutes a day right away. A free account lets you keep playing, save your results, track your progress and unlock the daily workout.

Does it work on a phone?

Yes, the trainer runs in the browser on phones, tablets and computers. There’s nothing to install.

Save your results and track your progress

Free sign-up: round history, a chart by skill and a daily workout of 5 exercises. No credit card needed.

All trainers

Mini Sudoku: 4×4, then 6×6 against the clock