To enjoy Sonic Frontiers in its definitive Switch form, you need more than just the base XCI. The keyword summarizes the entire ecosystem: The Base game (NSP/XCI), the massive 1.4.1 update that fixes performance, the Final Horizon DLC that fixes the story, and the US region code to ensure compatibility.
Sonic Frontiers Switch NSP XCI DLC Update US: The Ultimate Performance and Content Guide sonic frontiers switch nsp xci dlc update us
The latest update is structurally required to run the game's DLC expansions. The Free Content Roadmap: Sights, Sounds, and Speed To enjoy Sonic Frontiers in its definitive Switch
Usually contains the base Sonic Frontiers game. Some advanced XCI dumps are "super-trimmed" or bundled, meaning the updates and DLC are permanently injected into a single XCI file. sonic frontiers switch nsp xci dlc update us