One of the things I’ve most liked about introducing my students to new logic puzzles is that they’ve been new to me as well! I was initially hesitant to try the hashiwokakero puzzles with my students because they sounded scary. I learned about these puzzles from reading the slides from Jeffrey Wanko’s NCTM presentation. You can check out the slides from his various presentations on using logic puzzles in the math classroom on his website.

My kids preferred calling these “Bridge” puzzles. And, I’m totally okay with that. Though, I find myself thinking of them as “Hashi” puzzles.

I put puzzle A from this document on the SMARTBoard for us to solve together as a class. After working through it together with a few bumps along the way, I gave students their own two puzzles to solve. (Puzzles B and C from the previously linked document).

Here are the rules for hashi puzzles:

• The bridges must begin and end at islands, traveling in a straight line (horizontally or

vertically)

• The bridges must not cross any other bridges or islands

• No more than two bridges can connect a pair of islands

• The total number of bridges connected to each island must match the number on that

island

Several students decided these were their favorite logic puzzles yet.

I let one of my classes vote one day as to which puzzle they would like a chance to do again, and these puzzles were a huge winner by a landslide.

## More Printable Paper and Pencil Logic Puzzles

- Sankaku Puzzles
- Strimko Puzzles in the Classroom
- Square Sudokus
- Make It Pythagorean Puzzles
- Number Ball Puzzles by Naoki Inaba
- Hidato Puzzles
- Step Puzzles by Naoki Inaba – A Logic Puzzle for Introducing Arithmetic Sequences
- Kazu Sagashi Puzzles from Naoki Inaba
- Factor Tree Puzzles Inspired by Dr. Harold Reiter
- Strimko Logic Puzzles Review
- Tents and Trees Puzzles
- Slants Puzzles
- Angle Mazes by Naoki Inaba
- Zukei Puzzles
- Japanese Logic Puzzles for the Secondary Math Classroom
- Area Maze Puzzles from Naoki Inaba
- Masyu Puzzles
- KenKen In The Classroom
- Futoshiki Puzzles
- Hashi Puzzles
- Shikaku Puzzles
- Nonogram Puzzles
- Digit Cells Puzzle

Anonymous

Thursday 14th of May 2015

I wonder if there is a version in which you can provide "moving islands," so that the students must place the numbered islands in a way to enable the building of bridges within the rules. (This problem is made a bit easier if any straight line bridges -- no curves; yes diagonals -- are allowed, rather than just horizontal and vertical bridges.)

Mrs. Pertierra

Thursday 14th of May 2015

The link to the website of lesson plans for logic puzzles doesn't seem to be working. :(

Mrs. Pertierra

Friday 15th of May 2015

PertierraM@duvalschools.org

Sarah Carter (@mathequalslove)

Thursday 14th of May 2015

It's working for me. Send me an e-mail, and I will send you the PDFs.

mathlady

Thursday 14th of May 2015

Thanks for sharing! I teach an elective Problem Solving Seminar for 7th graders. They love Ken Ken and I am going to try some of these with them over the next few weeks.

Sarah Carter (@mathequalslove)

Thursday 14th of May 2015

That class sounds like it would be a blast to teach!

Anonymous

Wednesday 13th of May 2015

Awesome resources! Thank you so much for sharing! :)

Sarah Carter (@mathequalslove)

Thursday 14th of May 2015

You're welcome!