A new button added to the Easy, Medium or Hard map difficulty screen
Use a default or custom roundset
Add any special rules you want
Standardized Mod Sources Folder for Mod Creators
In the Mod Helper Settings, you can choose a folder on your computer as your "Mod Sources" folder
The Mod Helper will keep an updated "btd6.targets" file in that folder that your Mod projects can import to automatically:
Get all the correct Melonloader and BTD6 dependencies
Include all .png/.bundle files in your project as embedded resources
Copy your dll file to the Mods folder on build
Any mod utilizing "btd6.targets" could be downloaded by anyone into their own Mod Sources folder and have all of the above features automatically, regardless of either modders' BTD6 install location
There's also an In Game screen where you can create a new empty Mod project in your Mod Sources folder, or upgrade a mod project that's already in there to use the new .csproj format
Other
A new loading system for mods, allowing long tasks to be added to the games own initial start up tasks
Internal improvements to resource loading, reducing lag from loading in custom images and models
A standardized way to use the same byte loading strategy as Ultimate Crosspathing
Full, automatically generated documentation for all Mod Helper classes, API methods and extensions
Patches for BloonsMod melons will now be try-catched by default, meaning one patch failing after a BTD6 update won't break your whole mod
Custom outline colors for your ModDisplays!
Obsolete Things
The old methods of Mod auto updating.
The keycode hooks are no longer active, as they have too much overhead when you can now just use a ModSettingHotkey
Certain previous properties of ModSettings that weren't widely used