Educational5 min · Aug 4, 2026
Naked Triples: A Deep Dive
Naked triples extend naked pairs to three cells. The pattern hides in plain sight because the three cells do not need matching candidate sets.
Educational posts
12 posts in this category.
- Educational4 min · Jul 14, 2026
Flow State and Sudoku
Sudoku ticks every box that flow-state research lists for absorbed attention. What that means, and what it does not mean.
- Educational4 min · Jun 23, 2026
Samurai Sudoku: A Friendly Walkthrough
Five overlapping 9x9 grids in a single shape. Samurai is easier than its size suggests, once you know the rhythm.
- Educational5 min · Jun 16, 2026
Hidden Pairs: A Deep Dive
Hidden pairs are the inverse of naked pairs and easier to miss. The scan flip that finds them, with a worked example.
- Educational4 min · Jun 8, 2026
Sudoku and Stress: What It Actually Does
Sudoku as stress relief is a small claim with a real basis. The displacement effect, the research, and when the puzzle is the wrong tool.
- Educational4 min · Jun 2, 2026
Jigsaw Sudoku: A Friendly Walkthrough
Jigsaw sudoku replaces the 3x3 boxes with irregular regions. Once the visual chaos settles, it plays almost exactly like classic. Here is the plan.
- Educational5 min · Jun 1, 2026
Naked Pairs: A Deep Dive
Naked pairs are the first elimination technique most solvers learn and the one most often misused. The precise pattern, worked example, and the three common mistakes.
- Educational4 min · May 26, 2026
Sudoku and Aging: The Honest Answer
Older readers are the largest sudoku audience. Whether the puzzle helps the aging brain is a real question with a smaller answer than the headlines suggest.
- Educational4 min · May 21, 2026
Killer Sudoku: A Friendly Walkthrough
Killer sudoku looks intimidating because of the cage sums. It's actually friendlier than hard classic, once you know the bag of tricks. Here are the essentials.
- Educational4 min · May 19, 2026
A Pencil-Mark Workflow That Actually Works
Half-marked sudoku grids lie to you. The four-step pencil-mark workflow that keeps medium and hard puzzles honest, plus the cardinal sin to avoid.
- Educational7 min · May 15, 2026
Sudoku Rules Explained in Five Minutes
Three rules, one grid, no maths. A quick, complete guide to the rules of sudoku with examples of what counts as valid and what does not.
- Educational8 min · May 14, 2026
What is Sudoku? A Plain-English Guide for Beginners
Sudoku is not a maths puzzle. It is a logic puzzle that uses digits as labels. Here is what it actually is, in plain English, and why it caught on.