The Krazydad Discord Community is a new place where you can talk to me, and meet other people who are interested in puzzles. A great place to report problems or mistakes with this website, suggest new features, help me brainstorm and test out new puzzles, get periodic announcements from me, or discuss other deep thoughts. Maybe I'll see you there!
Circle 9 Puzzles by KrazyDad
Here are hundreds of free Circle 9 puzzles suitable for printing.
Circle 9 is a new puzzle invented by James Dewar of circle9puzzle.com. This addictive puzzle is played on a Sudoku grid, but has very different rules. The object is to circle just the nine numbers 1–9, such that each row, column, and block contain a single circled number.
I am providing two different collections. A set of classic Circle 9 puzzles, played on classic Sudoku grids, and a a set of variety puzzles (six different varieties per booklet). The varieties include diagonal, windows, and symmetrical and asymmetrical jigsaw grids.
Each set of 100 books is sorted roughly by difficulty — the puzzles get more difficult as you progress from book 1 to 100. Regardless of the difficulty level, there is always a single unique solution that can be solved with logic, and without guesswork.
Special thanks to James Dewar (@jkdewar on Discord) who invented the classic puzzle, introduced it to me, and granted permission for me to construct these puzzles for you.