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About pzprjs

pzprjs enables one to create or edit pencil puzzles like sudoku and yajilin which are solved with specific rules on boards. It is developed using HTML5 features and JavaScript.

This project is a fork of the original sabo2/pzprjs; it is live on

Bugs, questions, contributions

Please file issues using the issue tracker if you run into any issues with pzprjs. Or write to feedback at, or join to discuss.


Translations can be contributed using Weblate (no account required).

Repository structure

The core of the puzzle solving and editing applet lives in src/. The list of puzzle types is in src/pzpr/variety.js, the implementation of the various types within src/variety/. Tests for these types are found in test/script/ and test/variety/. The test cases in test/script/ are also used to generate instructions.

The web UI around the applet (buttons, options, background etc.) live in src-ui/.

Building and testing

Calling make will build the project to dist/. Depending on your browser's security settings, you can interact with the result directly by opening dist/p.html or dist/list.html in your browser. Otherwise, you may need to run a web server, e.g. by running python -m http.server within dist/ and visiting http://localhost:8000/list.html.

Calling make test will run the unit tests.

Adding a new puzzle type

Adding a puzzle type involves the following:

  1. Define a new type in src/pzpr/variety.js. This could be a new base type mytype which will go in a new file src/variety/mytype.js, or be based on an existing type oldtype, in which case you'll edit src/variety/oldtype.js. (E.g., the type aho is defined in shikaku.js.)

  2. Implement the type in that file in src/variety/. The parts of a type implementation are

    • Input event handling, by customising MouseEvent and KeyEvent. Every type has a number of "input modes", and typically one custom "auto" input mode.
    • Board customisation, by customising Cell, Board etc.
    • Rendering, by customising Graphic.
    • URL and file encoding, by customising Encode and FileIO. Encode is used to deal with pzpr URLs, while FileIO is used when you save a board state to file (see tests below).
    • Answer checks, by collecting names of checks in AnsCheck.checklist, implementing checking methods in AnsCheck, and defining failure codes and messages in FailCode.

    Have a look at existing types to see how multiple types within one file share code.

  3. Add a test file for the new type in test/script/mytype.js. This must include a full suite of example boards that trigger the various fail codes one by one. Ideally, this would be one example puzzle that shows various errors, but it's fine to deviate from that. The boards are stored as strings as generated by "File -> Save file as...", with newlines replaced by slashes.

    Furthermore, if your type does any tricky input handling, it's a good idea to add some input scripts in the inputs section of this test file.

  4. Add the new type to the web UI by adding it to each of src-ui/js/v3index.js and src-ui/list.html.

  5. Add a background tile as src-ui/img/mytype.png and add the type in src-ui/js/ui/Misc.js:toBGimage.

  6. Add a line to

Steps 1 and 2 should be enough to be able to interact with the type by visiting p.html?mytype. Feel free to skip steps 5 and 6 when submitting a pull request for a new type.


There are some Japanese terms in the source code that may not be obvious.

irowake: per-component coloring peke: cross mark


Playing and editing puzzles by Javascript (fork of sabo2/pzprjs)







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