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Free Slitherlink Puzzles from KrazyDad

Slitherlink is an addictive logic puzzle that was first published by Nikoli in Japan. The puzzle consists of a grid of dots, with some clue cells containing numbers. 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 clue numbers indicate how many lines surround the cell. Empty cells may be surrounded by any number of lines (from 0 to 3).

There is one unique solution, and you should be able to find it without guessing. You may find it helpful to make Xs between dots that cannot be connected.

Here are hundreds of free Slitherlink puzzles suitable for printing.

Need some help? I'm working on a tutorial, and it will be up soon. In the meantime, here are some good solving tips from Wikipedia.

NEW: Penrose Slitherlinks & more!

I made these Slitherlink puzzles with non-square grids to make them more interesting. My favorite are the Penrose tiles, a quasi-periodic 5-fold tiling discovered by Sir Roger Penrose (shown below).

The Altair puzzles, derived from a traditional Islamic tiling, are a bit easier.

The Laves tilings are denser, and have a lot of 6-way intersections. These are my toughest Slitherink puzzles.

Penrose Tile Puzzles

NEW: Altair Tile Puzzles

Laves Tile Puzzles

Snowflake Slitherlinks

Thanks to Craig Kaplan for discourse and data while I was working on these puzzles.

All puzzles ©2008 Jim Bumgardner / KrazyDad. Some source code was derived from Simon Tatham's puzzle collection. Square Slitherlink algorithm developed by Mike Panna with contributions from Krazydad. Feel free to reproduce the puzzles for personal or school use. If you would like to publish these, or similar puzzles in a newspaper or book, or would like a larger or different selection of puzzles, contact me at dad@krazydad.com.

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