Requires dumping the RomFS using tools like NXDumptool. How to Extract and Use the RSDK File
If you’re reversing or studying the format: sonic mania rsdk file
One of the most useful discoveries was "Data Folder Mode." By extracting the contents of the Data.rsdk into a folder named "Data" and then removing the original .rsdk file, the game engine shifts into a developer-like state. This allows modders to edit sprites or files in real-time; any change made to a file in the folder appears instantly in the game without the need to repack the entire archive. Porting Mania to Everywhere Requires dumping the RomFS using tools like NXDumptool
This single file allowed the community to bring Sonic Mania to platforms it was never officially intended for, such as: Porting Mania to Everywhere This single file allowed
Note: Most modding today uses folders (mod loaders like Mania Mod Loader bypass the packed RSDK).