An example 10×10 Sudoku: ten symbols fill every row, column and 2×5 box (a few 1-9 shown).
10×10 Sudoku is a ten-by-ten grid divided into 2×5 boxes, filled with ten different values - usually the digits 1-10 or 0-9. Each row, column and box must hold every value once. It is a gentle large format, only a step up from the 9×9 in size.
The rule: ten values in every row, column and 2×5 box
Fill the grid so no value repeats in any row, any column or any 2×5 box (two cells tall, five wide). One box holds a complete set - below, a 2×5 box is filled with 1 through 10.
One 2×5 box holds all ten values (1-10). The full grid has ten such boxes.
Wide boxes, familiar logic
A 2×5 box spans five columns but only two rows, so - as in the 6×6 and 8×8 - column scanning tends to be a shade more powerful than row scanning. Beyond that, everything is ordinary Sudoku at a slightly larger scale: the same singles, pairs and fish patterns all apply.
Numbers or 0-9
Two labelling schemes are common. Using 1-10 is clear but makes the "10" cell two characters wide; using 0-9 keeps every cell to a single digit. Either way the puzzle is the same - ten distinct symbols, one of each per row, column and box.
Solving strategy
- Scan columns first. The wide 2×5 boxes make column eliminations effective.
- Complete near-full units. A unit with nine of its ten values gives the tenth for free.
- Pencil-mark carefully. Ten candidates per cell is more to track than the 9×9's nine.
- Use the same techniques as 9×9. Every method scales up unchanged.
Common mistakes
- Expecting square boxes. The boxes are 2×5 rectangles - check the borders first.
- Mixing the schemes. Decide whether the grid uses 1-10 or 0-9 and stick with it.
- Forgetting a value. All ten must appear in each unit.
- Rushing. The extra size rewards steady, careful work.
Can I play it here?
Not yet - Sudoku 10×10 isn't one of the puzzle types SudokuStreak generates for now. But you can learn its rules above, and there's plenty here to sink your teeth into meanwhile:
- Try the closely related Classic, which you can play right now.
- Browse all the Sudoku variants we do offer.
- Or print free puzzles from the printable PDF page.
Where to play it
Sudoku 10×10 belongs to the size variant family and runs on 10×10. It is not one SudokuStreak generates yet - but the deduction it trains is the deduction every Sudoku runs on.
Difficulty and type are two separate dials here: the type sets the extra rule, the level sets how much of the grid you start with. Expert Sudoku leaves 25 of the 81 cells filled, where the beginner tools dry up almost entirely; Evil Sudoku leaves 23, with no easy moves at all. Take it at the gentler end while the pattern is still new, and move up once it stops being a fight.