This guide is simply a link to the Marble It Up! Ultra Level Kit, uploaded on GitHub and accessible on the official Discord server as a pinned message in #level-building. This link is here in order to make the information more accessible for users who are using Google or searching the Steam guide. (To be fair, the Github is the first result if you google 'Marble it up ultra level building' but still)


https://github.com/MarbleItUp/MarbleItUpUltraLevelKit

The guide contains instructions on Setup and usage, which are the following links:
https://github.com/MarbleItUp/MarbleItUpUltraLevelKit/wiki/Setup-Guide
https://github.com/MarbleItUp/MarbleItUpUltraLevelKit/wiki/Level-Building-Tutorial


I am not the original creator of these resources, and am simply uploading this as way to index the information and make it more accessible, as the Guides section of Steam was the first place I looked for this info and was surprised to be unable to find it.