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Nonogram Puzzles

I heart logic puzzles.  Give me a long road trip where I’m not the one driving, and I’ll probably be doing one of two things when I’m awake: reading or working logic puzzles.

One of my favorite logic puzzles is one I learned about in high school.  My high school calculus teacher would leave us packets of logic puzzles to solve on days when we would have a substitute.  In one packet, there was a certain puzzle that frustrated me.  There was a set of cells that were either colored in or not colored in.  And, there were clues around the edges to help determine which cells were which.  The numbers around the puzzle tell how many cells in a row are colored in.  This puzzle took me hours to solve, but I couldn’t give up.  Once I figured out a strategy, I was so proud of myself.  And, I was also hungry for more puzzles like that to solve.  I found several free sources of these on the internet, and I’ve been solving them on and off ever since.

Here’s an example from the puzzle handout I gave my students:

nonogram puzzle example.
Source: https://www.griddlers.net/images/iGridd_Demo.pdf
 

This file that I printed puzzles from for my students to do also has the best rule explanation I’ve seen for these type of puzzles.

basic rules for nonogram puzzle.
Source: https://www.griddlers.net/images/iGridd_Demo.pdf
 

These puzzles have only about half a billion different names that they go by: Nonograms, Paint by Numbers, Griddlers, Pic-a-Pix, Picross, PrismaPixels, Pixel Puzzles, Crucipixel, Edel, FigurePic, Hanjie, HeroGlyphix, Illust-Logic, Japanese Crosswords, Japanese Puzzles, Kare Karala!, Logic Art, Logic Square, Logicolor, Logik-Puzzles, Logimage, Oekaki Logic, Oekaki-Mate, Paint Logic, Picture Logic, Tsunamii, Paint by Sudoku and Binary Coloring Books.  (And, yes, I did just copy and paste that from Wikipedia.)

partially completed nonogram puzzles.

Before giving my students 6 puzzles from this handout to solve on their own, we worked one puzzle together as a class. This puzzle was downloaded from Web Paint-by-Number.  I started by showing students a few strategies for filling in boxes.  Soon, they were full of their own ideas.

Their assignment was to complete 2 of the puzzles on their own during the class period.  Some students chose to do more than 2.  Others stopped after fulfilling the minimum requirement.

completed nonogram puzzle.
Source: http://webpbn.com/
 

One thing I’ve noticed about my students this year is that they really struggle with thinking logically.  Their main tendency is to narrow a situation down to two or so ways and then randomly choose one to go with.  The idea that it is possible to know something for certain is foreign to them.  But, we’re working on that!

My favorite part of assigning my students these logic puzzle type tasks is eavesdropping on their conversations.  Hearing students explain their reasoning to one another makes my day.  It’s something I need to make happen more often in my classroom.

Did all of my students love these puzzles?  No.  Did it push all of them out of their comfort zones?  Yes.  Several of my students enjoyed these puzzles so much that they downloaded apps to their phone to solve extra puzzles over the weekend.  Yay!  😀

Heidi

Thursday 2nd of May 2019

Hi Sarah, I love trying all the puzzles you share with my 7th grade classes. I would like to try these, but am having trouble locating the sample one you did as a class. I was wondering it you had a picture of it without the markings? Thanks for all you share!

JDiels

Wednesday 14th of February 2018

Anyone who enjoys puzzles should try the annual pi day challenge which is published online every March 14 at pidaychallenge.com. It's awesome!

Minoueel

Wednesday 29th of April 2015

I need to try one of these of my own.

Sarah Carter (@mathequalslove)

Wednesday 29th of April 2015

Hope you enjoy it!

Unknown

Tuesday 28th of April 2015

I have these on my Kindle and LOVE them (as does my 11-year-old daughter). I also love the traditional logic puzzles - a grid with 4 or 5 clues as to who was wearing what color, eating what food and playing with what pet (or things similar). LOVE them!

Sarah Carter (@mathequalslove)

Tuesday 28th of April 2015

I love those logic puzzles, too. I tried those with my kids this year, and they really struggled. I'm hoping we can build up to them with these other logic puzzles.

Matt E

Tuesday 28th of April 2015

I'm a big fan of the Slitherlink/Fences/Takegaki puzzles. (Search for "Conceptis Slitherlink" in the App Store.) I haven't used them in my classes much, but I certainly enjoy them!

Sarah Carter (@mathequalslove)

Tuesday 28th of April 2015

Definitely going to look into these! I heard someone rave about slitherlink puzzles before, but I've never tried one.

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