Hard Nonograms for Kids: 15x15 Puzzles
Updated November 2026 · 6 free printables
Six 15x15 nonograms for kids of 10 and up, the size of a classic picross puzzle: 225 squares, up to five numbers in a line and thick lines every five squares to keep your place.
About these printables
The hidden pictures are a sitting cat, a snowman, a lighthouse, a rabbit, a steam train and a jumping dolphin.
They take 20 to 40 minutes, and each one is solvable by logic alone, so a stuck solver can always find a next step by looking for a line where the numbers nearly fill the space. Good for fast finishers, rainy afternoons and grown-ups who want to race their kids.
At a glance
- Pages
- 6 free printables, one PDF each
- Ages
- 7 to 10
- Answer keys
- on page 2 of every PDF
- Paper
- US Letter and A4
- Price
- free, no sign-up needed to download
All 6 Hard Nonograms for Kids: 15x15 Puzzles, One by One
Here is a closer look at every page in this collection, with who it's best for and a coloring idea for each one.
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1. 15x15 Nonogram: Sitting Cat
A 15x15 nonogram for ages 10 and up, the size of a classic picross puzzle: 225 squares and up to five numbers per line. Solve it row by row and column by column to reveal a cat sitting with its tail curled up. No guessing needed; answer key on page 2. It is a hard puzzle page for ages 10 and up, and grown-ups will enjoy it too.
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2. 15x15 Nonogram: Snowman
A 15x15 nonogram for ages 10 and up, the size of a classic picross puzzle: 225 squares and up to five numbers per line. Solve it row by row and column by column to reveal a snowman with a top hat and stick arms. No guessing needed; answer key on page 2. It is a hard puzzle page for ages 10 and up, and grown-ups will enjoy it too. Add white for snow.
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3. 15x15 Nonogram: Lighthouse
A 15x15 nonogram for ages 10 and up, the size of a classic picross puzzle: 225 squares and up to five numbers per line. Solve it row by row and column by column to reveal a striped lighthouse shining its light. No guessing needed; answer key on page 2. Take your time: every hard puzzle is solvable by logic alone.
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4. 15x15 Nonogram: Rabbit
A 15x15 nonogram for ages 10 and up, the size of a classic picross puzzle: 225 squares and up to five numbers per line. Solve it row by row and column by column to reveal a rabbit face with two tall ears and a little nose. No guessing needed; answer key on page 2. Take your time: every hard puzzle is solvable by logic alone.
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5. 15x15 Nonogram: Steam Train
A 15x15 nonogram for ages 10 and up, the size of a classic picross puzzle: 225 squares and up to five numbers per line. Solve it row by row and column by column to reveal a steam train with a smokestack and cab. No guessing needed; answer key on page 2. It is a hard puzzle page for ages 10 and up, and grown-ups will enjoy it too.
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6. 15x15 Nonogram: Dolphin
A 15x15 nonogram for ages 10 and up, the size of a classic picross puzzle: 225 squares and up to five numbers per line. Solve it row by row and column by column to reveal a dolphin jumping out of the water. No guessing needed; answer key on page 2. Take your time: every hard puzzle is solvable by logic alone.
Tips for coloring Hard Nonograms for Kids: 15x15 Puzzles
- Add each line's numbers plus its gaps; the closer to 15, the more squares you can fill right away.
- Use the thick lines every five squares to count without losing your place.
- Work in pencil and take a break if you get stuck; fresh eyes see the next step.
Fun facts about Hard Nonograms for Kids: 15x15 Puzzles
- A 15x15 grid has 225 squares, and these puzzles have up to five numbers in one line.
- Lighthouses have different stripes so sailors can tell them apart in daylight.
Fun ways to use your printables
- Race a grown-up on the same puzzle.
- After solving, turn the picture into a colored pixel art poster.
How to print
Click Download PDF on any page and print it at 100% on US Letter or A4 paper. Use regular printer paper for crayons and pencils, or cardstock for markers and paint. Every page here is free for home, classroom and party use, so feel free to print as many copies as you need.
Frequently asked questions
How do you start a 15x15 nonogram?
Add up each line: numbers plus the gaps between them. If the total is close to 15, many squares are fixed. A row of 13 in 15 squares always shades the 11 middle squares. Mark them, put X marks where the line is complete, then move to the columns.
What if I get stuck?
Look for a line that is almost finished, or one where a block is already touching the edge. Check that every shaded block matches its number. Because the puzzles never need a guess, a careful look always shows another square to fill.