Nonograms vs other logic puzzles

A family of pencil-and-paper puzzles

Logic puzzles have filled newspaper margins and commuter pockets for over a century. They share a simple promise: every answer follows from the clues by pure reasoning, with no luck involved. Sudoku, kakuro, crosswords, and nonograms all belong to this family of grid-based pencil-and-paper puzzles, yet each one asks your brain to work in a different way.

A nonogram — also known as picross, griddlers, hanjie, or pic-a-pix— is a grid puzzle where number clues beside each row and column tell you the lengths of consecutive runs of filled cells. Solve every line and a picture emerges. ("Picross" is Nintendo's trademarked name, short for "picture crossword," while "hanjie" and "griddlers" come from the British newspapers that popularised them.) If you are brand new, the beginner's guide walks through the rules step by step.

So how does a nonogram actually differ from the other puzzles you might find on the same page of a puzzle magazine? Below we compare them one by one, then explain the single feature that sets nonograms apart from all of them.

Nonograms vs sudoku

Sudoku is the most famous logic puzzle in the world, so it is the natural place to start. Both sudoku and nonograms are pure-logic puzzles — you never need a fact you don't already have, and a well-made puzzle of either kind has exactly one solution reachable without guessing. The difference is the type of constraint you reason about.

Sudoku is a number-placementpuzzle. You place the digits 1–9 so that none repeats within any row, column, or 3×3 box. Every clue is a uniqueness constraint, and the numbers themselves are just nine distinct symbols — you could swap them for nine colours or shapes and the puzzle would be identical.

Nonograms instead rely on run-length deduction. The clue "4 2" on a row does not place a value anywhere; it tells you a block of four filled cells comes before a block of two, with at least one gap between them. Your job is to work out where those runs can and cannot sit, marking cells as filled or empty. And when a sudoku is solved you are left with a grid of digits; when a nonogram is solved you are left with an image.

Nonograms vs kakuro

Kakuro looks like a crossword skeleton but plays like an arithmetic cousin of sudoku. Each "word" is a run of white cells with a target sum printed in a clue triangle, and you fill the run with the digits 1–9 so they add up to that sum without any digit repeating inside the run. It is the closest relative to nonograms in one respect: both put numbers in the margins.

But the numbers mean opposite things. In kakuro a clue is a sum— the total of the digits you must place in the cells. In a nonogram a clue is a length— how many cells in a row are filled, never their value. Kakuro asks "which digits add to 17 in three cells?" A nonogram asks "where can a run of three filled cells physically fit given everything else on this line?" One is combinatorial arithmetic; the other is spatial reasoning. And once more, kakuro leaves you with a wall of digits, while a nonogram leaves you with a picture.

Nonograms vs crosswords

Crosswords are the odd one out in this group, because they are not really a logic puzzle at all — they are a knowledge and vocabulary puzzle. To solve one you need trivia, wordplay, cultural references, and a wide vocabulary in a specific language. The grid only confirms answers you already know; the real work happens in your memory, not in deduction.

Nonograms need none of that. There is no vocabulary, no trivia, and nothing to look up. Every clue is a number, and every step follows from the rules of the grid alone. This makes nonograms language-independent: a player in Tokyo, Madrid, or Stockholm sees the exact same clues and solves the exact same way, because numbers and grids translate to everyone. A crossword built for English speakers is useless to someone who doesn't read English; a nonogram is the same puzzle everywhere on earth.

That accessibility is a big part of why nonograms spread so quickly once they were invented — you can read more about that in the history of nonograms.

Side by side

Why nonograms are unique

Look down the "output" column above and the difference jumps out. Sudoku, kakuro, and crosswords all leave you with the same kind of artefact you started with: symbols in a grid. A solved sudoku is a grid of digits. A solved crossword is a grid of letters. Useful, satisfying, and then quietly forgotten.

Nonograms are the only puzzle in the family whose solved grid is a picture. As you mark the final cells, a heart, a cat, a sailboat, or a tiny dinosaur snaps into focus — a reward no amount of digits can match. That little hit of dopamine when the image suddenly appears is the whole point, and it is why so many people describe nonograms as relaxing rather than merely clever.

Combine that payoff with the fact that the puzzle is pure deduction, needs no vocabulary, and works identically in every language, and you have something genuinely distinct: a logic puzzle anyone, anywhere can pick up, and one that rewards the effort with art instead of arithmetic. Play one now and watch the picture appear.