I have successfully used it to solve a number of my ‘super tough’ puzzles. The technique is a generalization of XY-Wing, and solves many of the same puzzles that can be solved by other advanced techniques such as conjugate pairs, and coloring, but it does not feel as much like ‘guessing’ as those other techniques. UPDATE: Eduyng Castaño wrote to me about a technique he has discovered called Golden Chains (pdf). I find the various coloring/colouring and tabling methods to be too work-intensive for human use – they really make more sense for computer solvers, but sometimes they are the only methods you can use to solve a really hard puzzle.įinally, Michael’s Mepham’s Book of Sudoku contains an excellent 10-page introduction with various solving strategies, in addition to numerous puzzles. These strategies are especially good for solving the Tough and Super-Tough puzzles I offer here. I’ve found the XY-Wing and XYZ Wing patterns occur much more frequently, and are good weapons to have in your solving arsenal. The remaining strategies don’t come into play until the Tough puzzles.Īlthough the XWing (and Swordfish) patterns are easy to spot, statistical analysis shows they do not occur very often. The first 6 methods listed above (Naked Single thru Hidden Subset) are sufficient to solve all the “Easy” through “Challenging” puzzles I provide on this site, and most easy/medium newspaper puzzles. The Sudoku Strategy page explains most (but not all) of the simpler “pattern-matching” techniques. I have not yet found a single website that explains all of these techniques in one location, so I thought I’d provide some links to the various websites where I discovered these techniques. I’ve now learned a number of methods for solving tough Sudoku puzzles by hand, including X-Wing, Swordfish, Jellyfish, Squirmbag, Turbot-fish, XY-Wing, XYZ-Wing, Conjugate Pairs, Bowman Bingo, Simple Coloring, Super Coloring and Tabling. ![]() Unlike games of luck such as card and bingo games, guessing is never required. All Rights Reserved.Sudoku is a game of pure logical deduction, just like Kakuro and other Japanese number puzzles. If you would like to purchase new puzzles for publication, contact me at fun stuff.Ĭopyright © 2024 by KrazyDad. Variety Slitherlinks (6 different tilings per book)įeel free to reproduce the puzzles for personal, church, or school use. I made these variant Slitherlink puzzles with non-square grids to make them more interesting. Need some help? Here are some good solving tips from Wikipedia. In addition to the puzzles shown here, this site carries a number of Slitherlink variants, including Variety Slitherlink, Masyu, and my favorite Area 51. ![]() Want to save some trees? Try my Interactive Slitherlink puzzles. ![]() ![]() Want to get better at solving these? Try reading my latest stategy guide: The Ins and Outs of Slitherlink. You may find it helpful to make Xs between dots that cannot be connected. There is one unique solution, and you should be able to find it without guessing. Empty cells may be surrounded by any number of lines (from 0 to 3). The clue numbers indicate how many lines surround the cell. You connect horizontally or vertically adjacent dots to form a meandering path that forms a single loop or "Slitherlink." The loop must not have any branches and must not cross itself. The puzzle consists of a grid of dots, with some clue cells containing numbers. Slitherlink is an addictive logic puzzle that was first published by Nikoli in Japan. Here are hundreds of free Slitherlink puzzles suitable for printing. Slitherlink Puzzles by KrazyDad, Volume 1
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