The Kitnomicon

If you’re happy just building towers and keeping things primitive with Welcome To Hell, you can probably skip this. You don’t need the Kitnomicon to build outstanding towers. But if you’re the kind of person who wants to know how everything works, this book contains lots of useful information.

Unlike The Buildnomicon, we’re going to assume background familiarity with Roblox Studio and the Kit. Consider the book as what’s in the Kit, not an introduction to it. If you’re planning on creating your own kit objects or exploring the standard library, you’ll need to be comfortable with Luau and working with its type system. If those topics feel new, check out these resources first:

The Buildnomicon Every builder's comprehensive journey into Welcome To Hell.

Luau Documentation for the Luau language

This book only covers the stable Kit. Nightly Kit releases are planned once Act 3 or the Beta is released.

Finally, this isn’t the official specification for the Kit. One day, it will be made. For now, the Kitnomicon is the closest thing Welcome To Hell has to a specification.

Using The Kitnomicon

Typings

On many reference pages, you’ll see type annotations such as:

function KitStd.connectActivation(
  outerTrove: trove.Trove,
  connectTo: T & Instance,
  onActivated: (outerTrove: trove.Trove, instance: T, activationTrove: trove.Trove) -> (),
  defaultMode: ActivationMode?
): ()

While these type annotations are designed to be Luau-like, it is ultimately psuedocode included as a developer aid. For fully accurate and syntactically valid type information, please refer to the source code directly.