A Super Mario 3D Land level editor, originally made by Exelix11.
This is a continuation of Exelix' project trying to improve it as much as possible.
Extract your Super Mario 3D Land romfs folder using citra or godmode9 and load it following the program's steps, then open your level and edit as you like!
- Edits every 3D Land level and every file under romfs/StageData/
- 3D Previews of most assets
- byml <-> xml
- Improvements to the general user experience:
- Improved object database system with better args
- Improved controls and render view
- Redesigned UI
- Vastly improved Parent-Child editing
- Vastly improved Rail editing
- Added hotkeys for the most important features
- Recently open files option
- Option to save some special files like CCNT to a LayeredFS folder
- New:
- Fog editor
- Camera editor
- Object database editor
- Worldmap editor (experimental)
- Major improvement to rails, cameras and group editing
- Cutscene objects now display the model they'll use ingame
- Make Rail points part of the object treeview
- Show/hide Rails
- Better renderer
Use Visual Studio (not Code) with the .NET framework (specifically 4.5.2).
It should load fine so just select The4Dimension.sln and then build.
If you need help with Super Mario 3D Land Hacking, you can join the Tanooki Tree 
(Disclaimer: We cannot help you get the 3D Land files)