Are you ready for a new challenge?
Welcome to your next favorite logic puzzle.
Are you ready for a new challenge?
Welcome to your next favorite logic puzzle.
About the OCTO Puzzle
Buy OCTO® Puzzle Books
Buy OCTO® Puzzle Books
OCTO is a highly addictive logic puzzle, enjoyed by puzzle enthusiasts the world over.
The rules are simple: numbers cannot repeat in octagons, rows, columns and diagonals, and they have to add up to the provided diamond and diagonal sums. Puzzle difficulties range from youngster-friendly to brutally challenging, as you master dozens of techniques that combine position logic and good old-fashioned math.
OCTO puzzle books have sold thousands of copies, the puzzle has appeared in dozens of university newspapers, and the OCTO has been featured in local and international puzzle competitions. If you are ready for a new logic puzzle challenge, then OCTO is for you.
Buy OCTO® Puzzle Books
Buy OCTO® Puzzle Books
Buy OCTO® Puzzle Books
Click here to find OCTO Puzzle Books on Amazon.com
Now available on the Apple App Store!
Now available on the Apple App Store!
Now available on the Apple App Store!
OCTO Logic Puzzle App
How to Solve an OCTO Puzzle
Now available on the Apple App Store!
Now available on the Apple App Store!
About The Inventor
Doug Gardner
I am a puzzle and game designer who recently transitioned to living full-time in an RV. Prior to beginning the nomadic life, I lived in Northern Virginia and was active in the local Washington DC puzzle community. From 2011 to 2017, I organized and ran the Arlington Puzzle Festival, which featured a crossword puzzle tournament, a Sudoku tournament, and an OCTO competition.
In 2011, I patented the OCTO puzzle and have since sold books on-line and in person at fairs and flea markets.
OCTO Logic Puzzle, the updated OCTO puzzle app for iOS, is now available in the Apple App Store.