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🖼 A hidden picture is waiting inside the grid. Use the numbers above each column and beside each row to work out which squares to fill in — the answer key sits at the bottom, fold it backward along the dotted line before you start.

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Boo Who?

Nonogram · Puzzle No. 115 · ThePuzzleSolver.net

Medium

A logic-grid picture puzzle (also called picross or griddlers). Use the number clues to fill in the correct squares and reveal the hidden image.

Each number tells you how many squares in a row to fill in that line, in order. A clue of 2 2 means: fill 2 squares, leave at least one blank, then fill 2 more.

	0	5	6 3	5 2	1 1	2 3 2	2 1 1 2	2 1 1 4 2	1 3 1 1 1	1 1 1 1	1 3 1 1 3	1 1 1 4 2	1 1 1 1	2 3 2	3 1	5 1	3 3	5 1	4 2	5
7
2 2
1 1
1 2
3 1
1 1
1 4 4 2
2 1 1 1 1 2
2 4 4 2
1 1
1 1
1 5 1
2 1 1 2
1 1 1 1
1 5 1
1 2
2 1
1 1 2 1 1
2 3 5 4
3 2 1 4 2

20 columns × 20 rows

✂ fold backward along this line to hide the solution ✂

Solution hidden on screen — it prints automatically.

Solution

How to Solve This Nonogram

Nonograms (also called picross, griddlers, or hanjie) are logic puzzles that hide a picture inside a grid of numbers:

Start with the biggest clues. A row or column clue close to the full width tells you the whole line is nearly filled — mark those first.
Watch for lone single clues. A clue of just 1 sitting between two solved lines can often be pinned down early using the cells already fixed above and below it.
Work the overlap. When a clue number is more than half the line's length, the middle cells must always be filled no matter how the run shifts — mark those immediately.

This puzzle is a 20×20 grid. For the full method, edge logic, and tougher techniques once you're ready to level up, read our complete guide to nonograms and advanced nonogram techniques.

Walkthrough: Your First Four Moves

Not sure where to begin? Here's exactly how Mr. Puzzle opens this grid. Rows are numbered top to bottom and columns left to right.

Clear column 1. It has no clue, so mark it blank. Each row now has 19 squares to work with.
Row 19 (2 3 5 4). 2 + 3 + 5 + 4 plus three gaps is 17, leaving just 2 squares of wiggle room. That pins down column 7 (from the 3), columns 11–13 (from the 5) and columns 17–18 (from the 4).
Row 20 (3 2 1 4 2). 16 squares with gaps, leaving 3 of wiggle room. The 4 always covers column 14.
Columns 11 and 17. Both end with a 3, and both have row 19 filled. That last 3 has to include row 19 and can't go past row 20, so row 18 is filled in both columns.

Stuck? Click for a nudge

Most of the middle rows start and end with a 1 or 2. Those are the two sides of the outline. Pin down column 2 (5) and column 20 (5) and the sides fall into place.

Why It's Rated Medium

Every square can be worked out from the clues alone, with no guessing at any point. But the outline is one square thick, so most clues are small and scattered. It rewards slow, careful crossing more than speed.

Spoiler: what does this puzzle hide?

Boo Who? solves into a ghost drawn entirely in outline: a rounded dome of a head, two hollow eyes side by side, an open mouth picked out as a hollow rectangle, and a ragged wavy hem where the sheet trails off along the bottom. Only the edges are filled, so roughly seven cells in ten stay empty. Start with the long clue across the top and the crowded ones on the last two rows — they lock in the crown and the hem quickly, and the face gaps settle once the crossing column clues pin down the middle. Every square can be worked out from the clues alone, so you never have to guess and back up.

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