: Implemented a feature that dims the screen after 5 minutes of inactivity to protect OLED and other screens. Enhanced Gameplay Features

: Includes new stage transitions across the entire game and a redesigned main menu with a diorama-style preview system. New "Plus" Content Features Upgrading to the "Plus" version (via the Encore DLC ) unlocks the following: Sonic Mania Encore DLC review

To understand the phrase , you need to understand Switch file formats.

Sonic Mania Plus Switch — NSP update “Extra Quality” is an unofficial term likely referring to a fan or scene-distributed Switch package or an update labeled to imply improved assets. Evaluated below: origin, legality, technical risk, quality claims, playability, and recommendations. Conclusion: high caution; legitimate options exist that are safer and comparable in quality.