Sudoku and Nonogram are both grid-based logic puzzles you solve by pure deduction, so solvers naturally wonder how alike they really are. The short answer: Nonogram is distant to Sudoku. Below we lay out what the two share, where they part ways, and whether the skills you have built on Sudoku will carry over.
- Grid: Variable rectangle
- Closeness to Sudoku: Distant
- Also called: Picross, Griddlers, Hanjie, Paint by Numbers
What is Nonogram?
A grid where number clues on each row and column tell you the lengths of filled runs, revealing a hidden picture. Here are the rules in full:
- Each row and column has a sequence of numbers giving the lengths of consecutive filled blocks, in order.
- Blocks in the same line are separated by at least one empty cell.
- You shade cells in or mark them empty until every clue is satisfied and a picture emerges.
See a Nonogram picture
A Nonogram is solved by shading cells according to the number clues on each row and column, until a picture appears. Below, the clues have been solved to reveal a simple plus sign.
A finished Nonogram: shaded cells (from the row and column clues) form a picture.
Nonograms share Sudoku's pure-logic, single-solution spirit and the habit of marking what a cell can't be — but almost none of its mechanics. There are no digits to place: you shade cells from run-length clues, and the reward is a picture rather than a filled number grid. It's the most distant relative in this list.
What Nonogram shares with Sudoku
- Both are grid puzzles solved by pure logic with exactly one solution — never by guessing.
- Both reward marking what a cell can't be as much as what it is.
- Overlap reasoning in a Nonogram line rhymes with candidate elimination in Sudoku.
How Nonogram differs from Sudoku
- Nonograms are black-and-white, not numbers — you fill or leave blank, never place 1–9.
- Clues are run-lengths, and rows and columns are independent, with no boxes or Latin-square rule.
- The payoff is a picture, not a completed number grid.
Do Sudoku skills transfer?
Little transfers mechanically — there are no digits to place — but the mindset does: work each line for forced cells, mark impossibilities, and never guess. That "logic-only, prove every cell" discipline is exactly what Sudoku trains.
The verdict
A Nonogram shares Sudoku's pure-logic spirit but almost none of its mechanics — it's a picture-painting puzzle, not a number-placement one.