Hackvil is a modified version of Anvil V1.0.3b4 intended to make editing of Physics and Shapes a little easier than with Anvil and with more useful and more accurate help. Changes are a re-laying of the interface (in particular, scrolling lists in the shapes editor are now a decent length and quicker to work with) and improved built-in help. The Shapes editor window is resizeable too. Sound editing is disabled, folks are encouraged to use Sound Editor or Wail (which are better anyway). Efficiency stuff, though the better help should be of use to anyone. No actual bug fixes, of course.

I would actually suggest you keep the floating Help window open when using Hakvil, at least until you're familiar with its new contents. The built-in Help also flags up particular areas of Anvil where there are known problems (also marked "(!)" in the Editing window) and where you should refer to these notes for more guidance. These notes are intended as an addendum to the information in the built-in Help as well as being a standalone guide in their own right. Please note, however, that they no longer contain any information specific to other versions of Anvil ­ for simplicity I'm only covering Hakvil and Hakvil-related techniques. i.e. I'm writing about the techniques I use for editing; if you've got other methods that work for you then that's fine, but I'm not covering them here. Likewise, I've covered only those bugs and workarounds that apply to these tools and techniques ­ there are plenty other problems to be had using other methods too, but you're on your own there.

Hakvil Credits:

Application Hacking - Hamish Sanderson
Built-in-Help Hacking - Mark Levin
Installer Hacking - Claude Errera