This is a nasty surprise, but a welcome one. The DLC adds "Game Gear Mode" which forces you to play the tiny, pixel-perfect original resolution of the Game Gear games inside a CRT filter. Without the DLC, you only get the full-screen stretch filter.
The update for Nintendo Switch was released on June 23, 2023, as both a complete retail package and a $10 digital expansion for existing owners of the original Sonic Origins . Exclusive DLC & Key Features sonic origins plus switch nsp update dlc exclusive
Introduction Sonic Origins, released in 2022, packaged classic 2D Sonic the Hedgehog titles—Sonic the Hedgehog (1991), Sonic the Hedgehog 2 (1992), Sonic 3 & Knuckles (1994), and Sonic CD (1993)—into a single compilation with modern enhancements: upscaling filters, save states, museum content, and quality-of-life features like rewind and practice modes. The compilation aimed to celebrate Sega’s heritage while making early Sonic titles more accessible to contemporary audiences. However, its post-launch lifecycle created controversy when certain previously available extras and later-added content became fragmented across platforms through updates and DLC, particularly on Nintendo Switch NSP releases. This is a nasty surprise, but a welcome one