Calcudoku
Fill the grid with no repeats in any row or column, and match each cage to its target and its operation.
One puzzle a day, the same for everyone
The day's Calcudoku, 5 × 5, is drawn from the date. Its cages and their operations lead to a unique solution, identical for everyone.
- The same grid for everyone, until midnight.
- The cages lead to a unique solution, tested by a solver.
- The result you share is your time, never the solved grid.
- Completing a challenge, any of the four, extends your streak by one day.
The Free play / Daily challenge toggle sits at the very top of the board. The challenge never touches your free-play best times, and free play stays unlimited.
Five steps to your first grid
- No repeats. Every digit from 1 to N exactly once per row and per column.
- Read each cage. The outlined cage shows a target and an operation, for example “6 ×” or “1 −”.
- Look for the combinations. A two-cell “6 ×” cage is 2 and 3, or 1 and 6: the rest of the grid decides.
- Single-cell cages. A cage with no operation gives you its cell's digit directly.
- Cross-check without guessing. Every grid has a unique solution: reasoning is always enough.
What you need to understand
An input for every way to play
Mouse and trackpad
Click a cell, then a digit on the keypad. The cage label stays in the corner of its anchor cell.
Touchscreen
Cells, cages, and keypad stay readable and tappable with a thumb.
Keyboard
The arrow keys move the selection, 1 to N enter a digit, 0 or Backspace clears.
Five things you won't work out on your own
- Write down every combination for a cage before committing: a two-cell “6 ×” is 2×3 or 1×6.
- A subtraction or division cage ignores order: “1 −” is just as happy with 3 and 2 as with 2 and 3.
- Single-cell cages are gifts: they hand you the digit directly.
- The Latin-square rule (no repeats in any row or column) often eliminates half of a cage's combinations.
- Every grid has a unique solution: no gambling is ever needed, only cross-checking.
Calcudoku, in detail
Fill the grid without repeating a digit in any row or column, and make each outlined cage reach its target using the operation shown.
A cage carries a number and a sign, for example “6 ×” or “1 −”. The digits in the cage, in any order, must produce that result with that operation.
No. A two-cell “1 −” cage is satisfied by 3 and 2 just as much as by 2 and 3; you always take the larger minus the smaller, or divided by the smaller.
Yes. We start from a Latin square, carve out the cages, and then a solver confirms that only one grid satisfies every cage before it's displayed.
4 × 4 and 5 × 5 in free play. The daily challenge is 5 × 5.
It's your fastest time, saved per size.
The day's 5 × 5 Calcudoku is drawn from the date: the same one for everyone. The result you share is your time, never the grid.
It's the same kind of puzzle. KenKen is a registered trademark of Nextoy LLC, with which we have no affiliation. Our game is called Calcudoku, the generic name, and its generator is our own.
Keep exploring the site
All four games play right on the page, with no account and no download.