Click (or tap) a cell, then pick your number from the ring that opens around it — handy without using the keypad below!
Fill the grid with the numbers 1 to 6.
Every row, column and 2×3 box must contain each number only once!
- ✏ Notes — pencil in possible numbers in a cell without committing. You can also switch it on with the Space key or a right-click on a cell you can fill.
- ✕ Erase — clears a cell's number.
- ↩ Undo — reverts your last move.
- 🆘 Help — animates the grid to show you where a number goes.
- ⊙ Ring — a circle of numbers opens around the cell for faster play (tap the ⓘ right next to it to see how).
6×6 sudoku: the next step after 4×4
With its 36 cells arranged in 2×3 boxes, 6×6 sudoku is the ideal stepping stone between the 4×4 grid and classic sudoku. The same rules apply: every row, every column, and every 2×3 box must contain the numbers 1 to 6, each exactly once.
It's the perfect grid for kids aged 6 to 10, or for any beginner who just finished their first 4×4 grids. It also introduces notes mode, which lets you jot down possible numbers in a cell — a first step toward real solving techniques. Stuck? The 🆘 Help button animates the grid to show the way forward — see how this animated help works on the blog.
Why move from 4×4 to 6×6?
- More numbers to track — from 4 to 6 possible candidates per cell, a good visual memory exercise.
- Introducing notes mode — essential for tackling harder grids later.
- Still calculation-free — pure observation and logic.
- A real progression step — before the 8×8, then the classic 9×9.
Frequently asked questions
What age is right for Junior Sudoku 6×6?
Around 6 to 10 years old, or for any beginner who's already tried 4×4 sudoku and wants to move up to a slightly bigger grid.
What is notes mode?
It lets you jot down, in small print, every number that could still go in a cell — just like pencil marks on a paper grid. It's a first taste of real solving techniques.
Why not jump straight from 4×4 to classic 9×9 sudoku?
Because the leap would be too big. The 6×6 grid helps you learn to track more numbers at once and use notes mode, before tackling the 81 cells of classic sudoku.
After 6×6 sudoku, what's next?
The Junior+ Sudoku 8×8, then classic 9×9 Sudoku, available as a random grid or the daily puzzle.