Number Fill-In

Complete a crossing grid by placing every number from the list exactly once and matching the digits shared at intersections.

4 sizes · 7×7–13×134 independent difficulty levelsOriginal generation with a validated unique solution

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Every across or down slot must receive a number with exactly the same digit length.
Each number in the list is used exactly once.
When two slots cross, both numbers must have the same digit in the shared cell.
Select a cell to choose its slot; at a crossing, select it again to switch between the across and down slots.
The puzzle is complete when every slot is filled and all crossings agree.

Start with lengths that have only a few available numbers; each correct placement reduces the options at its crossings.
A shared digit can eliminate several candidates at once, so inspect crossings that already show a digit.
Turn on “Hide incompatible” when you want the list to show only candidates that fit the digits already fixed.
“Highlight dead ends” does not compare your grid with the answer; it only marks slots that no remaining number can currently fill.

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