The grid is shaped like a crossword. Every row or column of 3 or more white cells is a place for one number.
The list under the grid has one number for every place, grouped by the number of digits. One number starts in the grid.
Put every number into a place with the same number of cells as it has digits. Where two numbers cross, they must share the digit.
Numbers always read from left to right and from top to bottom.
The puzzle is solved when every place holds a number and no crossing clashes.
How to play here
Drag a number from the list onto a place in the grid, or tap the number and then the place.
A placed number is crossed out in the list. Drag or tap it again to move it to another place.
Tap a digit in the grid to take its number out. Where two numbers cross, the number across comes out first.
Keyboard: Tab to a number, Enter to pick it, the arrows to choose a place, Enter to drop it, Escape to cancel. In the grid, Delete takes a number out.
Undo takes back the last move.
Difficulty levels
Level
Grid up to
Numbers
Digits per number
Easy
7×7
8
3–5
Medium
9×9
12
3–6
Hard
11×11
18
3–5
Expert
11×11
18
3–5, harder to place
Tips
Start with a length that has only one number left: it can go in only one place.
Then look at places that already have digits from crossing numbers. Often only one number fits.
On the harder levels, try a number in a place and look at the numbers that cross it. If one of them then has no number that fits, the first number cannot go there.
FAQ
Is there only one way to fill the grid?
Yes. Every puzzle has exactly one answer, and you can always reach it by logic, without guessing.
Why is one number already in the grid?
It is your starting point. It is crossed out in the list and cannot be moved.
Can I move a number after I place it?
Yes. Drag it, or tap it in the list, onto another place with the same number of digits. Tap a digit in the grid to take its number out again.
What do the marked cells mean?
Two numbers that cross there show different digits. One of them is in the wrong place. A dashed frame marks an empty place that no number left in the list fits.
Is there a new puzzle every day?
Yes. A new Number Fill-In is published every day at each of the four levels: easy, medium, hard and expert. Earlier puzzles are in the archive.
Do I need an account to play?
No. You play right in your browser, with no sign-up and no cookies. Your progress is saved in your browser.