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Jigsaw Sudoku blog
Strategy guides, solving techniques, and tips for every level. Start with the complete strategy guide, then master the Law of Leftovers. Prefer to just play? Jump in below.
Jigsaw, Squiggly, Irregular: Why This Sudoku Has Five Names
Jigsaw, squiggly, irregular, nonomino, geometric — they're all the same sudoku. Here's where each name comes from and why one puzzle ended up with five of them.
How to Solve Jigsaw Sudoku: A Step-by-Step Guide for Beginners
Learn how to solve jigsaw sudoku step by step. A beginner's walkthrough of the irregular regions, your first moves, and a full worked example — no math, no guessing.
Jigsaw Sudoku Strategy: A Complete Guide to Solving Irregular Regions
A complete jigsaw sudoku strategy guide. Learn to solve irregular regions with the Law of Leftovers, region tracing, and the right technique order, beginner to expert.
The History of Jigsaw Sudoku: From Nonominoes to Squiggly Grids
The history of jigsaw sudoku: its Latin-square and nonomino roots, the sudoku boom that launched it, and how one puzzle ended up called squiggly, irregular, and geometric.
The Law of Leftovers: The Key Jigsaw Sudoku Technique
The Law of Leftovers is the signature jigsaw sudoku technique. Learn how it works, with worked examples, and use it to crack hard squiggly and irregular sudoku puzzles.
Advanced Jigsaw Sudoku Techniques: Beyond the Law of Leftovers
Advanced jigsaw sudoku techniques for expert solvers: region-aware pairs and pointing pairs, multi-row Law of Leftovers, X-Wings across irregular regions, and chains.
Jigsaw Sudoku Tips and Tricks to Solve Faster
Practical jigsaw sudoku tips and tricks to solve irregular-region puzzles faster — from tracing regions to the Law of Leftovers and the mistakes that cause restarts.
Jigsaw Sudoku vs Killer Sudoku: Which Variant Should You Try?
Jigsaw sudoku vs killer sudoku: how the two popular sudoku variants differ, which is harder, and which one to play based on what kind of puzzle you enjoy.
Jigsaw Sudoku vs Regular Sudoku: Is It Harder?
Jigsaw sudoku vs regular sudoku: the difference, whether it's actually harder, and which to play. A clear comparison of irregular regions versus standard 3x3 boxes.