Puzzle Design — The Puzzle Journal

Life is full of puzzles. Some you can see, some you can't. Some you can hold, some you can't. Some are fun, some are not. This is where we write about them — and, now and then, print one on a shirt.

Sudoku: How Puzzles Are Made—and What Makes Them Hard

October 12, 2026 · Sudoku · Puzzle Design · Logic · Puzzle Tees

The rules fit in a sentence. The craft behind the grid is another story. Explore Sudoku’s origins, the logic behind difficulty ratings, and our new Sudoku Across the Finish Line tee.