Free for teaching
Children and adults
InZeDokuLearn to reason. Through play.
A Sudoku and Calcudoku app for children and adults. Practise logic, addition and times tables through play, in class or at home.
Offline on Android · On Android, Windows and in your browser
No ads · No account →
The video
- A 2×2 sudoku is trivial: any child fills it in a few seconds.
- 3×3, 4×4, 5×5… the rule never changes, only the size grows.
- The reasoning gets longer very gradually: that is the whole point — small steps up to complex deductions, never a wall.
- You start at the level you want and stop at the level you want.
- And in Calcudoku, you choose the operations: addition alone to begin with, the others when the class is ready.
Calcudoku
Calcudoku: learn arithmetic through play.
Find a combination, add numbers, try another path: arithmetic becomes the key to the puzzle. Addition and times tables make sense within a grid instead of a list of calculations.
Start with addition alone. Then explore subtraction, multiplication, division, fractions and decimals at your own pace.
Explore Calcudoku →Pupils’ privacy comes first.
No pupil accounts · No ads · No data collection
Read our privacy commitments →An activity for every learning goal
One logical principle, extremely progressive, to reason and memorise through play — with grids suited to every age and every level.
- Reasoning through play — observe, eliminate, deduce and solve.
- Starting very simply — colours, shapes, pictures, first symbols and very small additions.
- Calculating & memorising — additions, subtractions, multiplication tables, divisions, fractions and other mathematical notions.
- Reading & memorising — letters, syllables, words, foreign languages and themed vocabularies.
- An extremely fine progression — from trivial grids solved in seconds to expert Sudoku and Calcudoku.
- Designed for teaching — screen, projection, printing, sharing by QR code, step-by-step help and solving history to understand mistakes, corrections and the path taken.
