Category Archives: Puzzles

Puzzle 174: Slitherlink (Unequal Lengths), and Russian GP recap

This past weekend, the WPF hosted round 4 of the 2019 Puzzle Grand Prix, with puzzles by Russian authors. Puzzles/solutions/results are currently available under the previous link but should show up in the archive eventually. I’ll go over how it went for me below. One very interesting new variant on the test was “unequal lengths slitherlink”; here’s one:

Unequal-lengths slitherlink

[applet without answer check]

Rules Solve as a regular slitherlink. In addition, any two connected straight line segments must have different lengths.

Continue reading

Puzzle 173: Scrin (and release pzprjs v0.11.0)

I’ve wrapped up my recent changes to pzprjs in a new release, full changelog below. It’s live now on Please let me know if you find any bugs, or would like to contribute some missing translations.

The latest addition is the Nikoli puzzle type Scrin (スクリン); here’s a small sample puzzle:

Rules Draw some rectangles, such that every clue is inside a rectangle (of the given size if specified). Different rectangles can only touch by corners, and all rectangles must form a single non-branching loop via these corner-connections. Rectangles without clues are possible. Continue reading

Puzzle 172: Ring-ring

Here’s a little Ring-ring puzzle I made when testing that a bug in pzprjs was really fixed. [] [].

An unsolved 9x9 Ring-ring grid.Rules Fill the empty cells of the grid by drawing rectangles that consist of horizontal and vertical lines between cell centers. The sides of different rectangles may intersect but not overlap. Rectangles can’t touch otherwise; in particular, they can’t touch by a corner.

Announcing, a.k.a. Puzzle 169: Angle Loop

Here’s another Angle Loop, and you can solve it on the new

(You might want to try the example first: is a clone/fork of the excellent, a puzzle solving site and applet built by Daisuke Kobayashi. It seems the author has moved on, so when I wanted pzv support for some angle loops of mine, I decided to go ahead and fork the project. I’m hoping will be updated again and would be happy for my changes to make it upstream! I’ll be putting effort into separating the changes useful for upstream from site-specific changes.

For most puzzle types you can move them from one site to the other by switching between and in the URLs.


There are three new puzzle types: Besides Angle Loop, there is Heyawacky which slightly generalizes Heyawake by allowing non-rectangular rules. And Nurimisaki is a type that was quite popular on the Japanese puzzle twitter this year, where it was shared using the Kurotto applet. I hope to post some example puzzles for the other types soon. The additions compared to are shown in the “Added puzzles” tab in the type list.

The second major change is that… links? come with “rich link preview”, or whatever you want to call it.


I intend to keep updating this with new puzzle types and fixes as I need them, but I’m also happy to accept contributions. I would be particularly grateful for help in keeping the project Japanese: Some of the changes I’ve made so far are lacking Japanese translations, so please let me know if you can help with that.

If you have a bug report or want to submit some changes, head on over to github: robx/pzpr-puzzlink for the site, or more likely robx/pzprjs for the puzzle applet itself.