This is a guide to the Chapbook story format for Twine 2.1 Story formats control how a story created with the Twine editor plays in a Web browser; once you select the Play button in Twine or publish your story to a file, whatever story format you have selected takes over.

Chapbook is designed to be easy to work with as an author and generate output that is a pleasure to read by players. It provides sensible default behaviors for your story that can be customized to fit your particular needs.

This guide does not assume you have any programming knowledge; however, it doesn't hurt to know CSS or JavaScript, as it uses both technologies heavily. It's split into several chapters that will gently guide you through the process of story creation.

This guide does assume, however, that you're familiar with the Twine 2 editor itself. If you're new to Twine, the Twine 2 guide is an excellent place to start. There are also numerous tutorials on the web that can be helpful.


Chapbook is released under the MIT license. Broadly speaking, it can be used to create free and commercial works alike without royalty payment of any kind. Mentioning Chapbook and Twine in the credits of your work isn't required, but it is appreciated.

Because Chapbook is open source, its ongoing development and maintenance is supported by Patreon supporters like:

Supporters at particular tiers receive access to devlogs, livestreams where Chapbook and Twine development are discussed, and recognition in this guide. If you use Chapbook, please consider supporting the project on Patreon.

How to Use Chapbook

For now, Chapbook must be added to the Twine editor by hand. To do this, choose the Formats button from the story list page you see when you first start up Twine, then the Add a New Format tab at the top of the dialog that appears. Paste the following address into the field and select the Go button:

Once you do that, you must set the story you're working with to publish using Chapbook. Edit one of your stories, then choose Change Story Format from the story menu at the bottom of the editor. Choose Chapbook here. Once you do, selecting the Play button or publishing your story to a file will use Chapbook format.

Chapbook will eventually also offer a release edition that removes all debugging tools and reduces download size.

Why To Use Chapbook

There is a relative embarassment of riches when it comes to selecting a Twine 2 story format. What are Chapbook's advantages?

  • Chapbook source code is easy to read. It disallows certain practices, such as nesting conditional statements2, and enforces others, like placing all variable declarations in one place in a passage, that lead to easier-to-follow code.

  • Chapbook has built-in functionality for common authoring scenarios. From cycling links to delayed text, many things you'll want to do with your stories will only require a single line of code.

  • Chapbook has a backstage view that aids in testing; it allows you to inspect the state of play, change variables on the fly, and save state anywhere so that you can quickly debug a particular part of your story.

  • Chapbook is designed to be used on a variety of devices, especially mobile ones. It uses responsive design to adapt its page layout so that it's readable on any type of device without having to zoom in or scroll unnecessarily. It also is lightweight– it currently contains 120K of code, which takes less than a second to load on cellular networks.

  • Chapbook's appearance can be customized without knowing HTML or CSS, and has built-in tools that allow you to preview style changes in your story immediately, so you can craft the appearance you're looking for without having to learn browser developer tools.

Why Not To Use Chapbook

  • Chapbook is young. This means that resources apart from this guide are scarce compared to the many tutorials you'll find related to the venerable formats SugarCube and Harlowe. And there will be fewer people to turn to if you have a question or encounter a problem.

  • Chapbook is an unfinished work. You will find many sections in this guide with a yellow background, indicating functionality that hasn't yet been added but is planned. It is also possible that functionality will change significantly before the 1.0.0 release, though the major concepts that Chapbook uses are fairly set in stone.

  • You've invested significant time already in learning another story format. There's nothing that Chapbook can do that other formats can't. It may be a bit more readable, depending on your point of view, but if you've already spent the time to learn how to write for another story format, there's

An Aside on Names

There's been some debate as to whether Twine produces games or merely stories: the truth is, with Twine you can make games, you can make interactive stories, and you can also make things that nobody can quite pin down. Keeping in the spirit of vexing formalists who prefer clear boundaries, this guide calls the things you'll create with Chapbook stories and the people who you share them with players, but you shouldn't infer anything from this usage. Please make strange things with Twine and Chapbook.

1. Chapbook, sadly, cannot be used with Twine 1 for now.
2. If you have programming experience, this idea may immediately cause some alarm–how can you possibly write anything serious without this functionality? Conditional Display discusses this subject, but it may be a bit hard to follow if you skip ahead immediately.

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