Perfect Square Day Hidoku Puzzles
These free printable hidoku puzzles are the perfect way to celebrate Perfect Square Day on September 16th, 2025 (3^2 / 4^2 / 5^2).
I recently got a message asking if I was going to create any new puzzles for the upcoming Perfect Square Day on September 16th (9/16/25). I had recently created some 1-9 hidoku puzzles, so I decided that if I could also create 1-16 hidoku puzzles and 1-25 hidoku puzzles that I could create a page of Perfect Square Day Hidoku Puzzles.
This puzzle is just one of many printable hidoku logic puzzles that I have created for my own classroom and am sharing with you!
Be sure to check out my entire collection of free printable logic puzzles.
What are Hidoku Puzzles?
Hidoku Puzzles (originally published as Hidato Puzzles) are the creation of Dr. Gyora M. Benedek, an Israeli mathematician. The Hebrew word “hida” means riddle. In a hidoku puzzle, you are given a grid with a selection of the numbers already filled in.
Your task is to fill in the missing numbers so that each number connects to the next number either horizontally, vertically, or diagonally. 1 must connect to 2, 2 must connect to 3, and so on.
When I use Hidoku Puzzles with students, I often have them draw in the lines between the numbers in order to help them check their solutions.
Perfect Square Day Hidoku Puzzle Instructions
Fill in the missing numbers in each square grid so that each number connects to the next number either horizontally, vertically, or diagonally.
For these specific puzzles, students are arranging the numbers from 1 to 9 in the first square-shaped grid, 1 to 16 in the second square-shaped grid, and 1 to 25 in the third square-shaped grid. In each grid, consecutive numbers should touch either horizontally, vertically, or diagonally.
You could definitely think of this puzzle as making a “chain of numbers.”
Four Levels of Puzzles and Printing Options
These Perfect Square Day hidoku puzzles are available in four different levels: Easy, Medium, Hard, and Challenging.
As the levels progress, you are given fewer and fewer numbers on the grid to begin with. This means that much more logic is required to solve the puzzle.
Perfect Square Day Hidoku Puzzle Files
These Perfect Square Day hidoku puzzles are available as a PDF or as an editable PowerPoint file.
Editable Powerpoint Files in ZIP Folder
Puzzle Solutions
Puzzle solutions are available on a password-protected solution page. I do not openly post the puzzle answer keys because one of my goals as a resource creator is to craft learning experiences for students that are non-google-able. I want teachers to be able to use these puzzles in their classrooms without the solutions being found easily on the Internet.
Please email me at sarah@mathequalslove.net for the password to the answer key database featuring all of my printable puzzles and math worksheets. I frequently have students emailing me for the answer key, so please specify in your email what school you teach at and what subjects you teach. If you do not provide these details, I will not be able to send you the password.
Not a teacher? Go ahead and send me an email as well. Just let me know what you are using the puzzles for. I am continually in awe of how many people are using these puzzles with scouting groups, with senior adults battling dementia, or as fun activities in their workplace. Just give me enough details so I know you are not a student looking for answers to the puzzle that was assigned as their homework!
