If you have the Plus version or the Encore DLC , you also gain: Sonic Mania Plus
Beyond technical fixes, the update introduces the : Sonic Mania Plus | Sonic Wiki Zone | Fandom sonic mania plus switch nsp update extra quality
Enhancing Sonic Mania Plus on Nintendo Switch: A Comprehensive Analysis and NSP Update Proposal If you have the Plus version or the
The 1.04 update addressed several technical and aesthetic issues present in the original release: Performance Fixes Digital Foundry analysis sonic mania plus switch nsp update extra quality
By owning the game, you can legally apply the “extra quality” mods (shaders, overclocks, and resolution patches) without any moral ambiguity.
Assumption used: user refers to an unofficial NSP update package distributed outside the official eShop that claims to add “extra quality” assets.