This baserom resource is provided to makers to create Super Mario World levels for the weekly Romhack Races, but it has also been built with general purpose hacking in mind and remains very flexible for any sort of project.
While lot of the changes made and patches included are to accommodate Kaizo level design in particular, it is perfectly suited to any sort of hack as those quality-of-life features are widely applicable.
To get started on a new project, check out the "Getting Started" or "Baserom Basics" pages.
For some other helpful information, read the "Frequently Asked Questions" or "Tips & Tricks" pages.
If you are seeking additional help or have questions, please visit the #baserom-support in the Romhack Races Discord server.
For more information about what's included in the baserom or how to use some of the resources, check out some of the pages below.
The baserom is managed on GitHub, so if you want to use it as the basis for your own project, or just to report an issue to the tracker, you can checkout the GitHub repository.
If you're looking for the latest version of the baserom, it can be always be found at the link below.
For information about level submitting, the playtesting process and other criteria for making for Romhack Races check out the following page on the baserom Wiki.
For information about contributing to the baserom or the project's credits, see the following pages.