For those using custom firmware (CFW) on Nintendo Switch:

File Integrity: Reputable scene groups (e.g., SUXXORS, Venom) release verified NSP updates with matching checksums to avoid corrupted data or ban risks.

If you are playing on PC, the process is slightly more streamlined:

Before diving into the update files, let's clarify the product. Sonic Mania originally launched as a digital-only title. Sonic Mania Plus is both a physical re-release and a paid DLC upgrade.

If you own the base Sonic Mania digital version, the "Plus" update adds:

From a file perspective, the difference between the base game NSP and the Sonic Mania Plus Switch NSP is that the Plus version includes an unlock key or integrated DLC that flags the game as the "Encore Pack."

Note: This section applies to modified Nintendo Switch consoles (CFW). Standard retail consoles receive these updates automatically via the Nintendo eShop or game card prompts.

Prerequisites:

Procedure: