Mario Kart 8 Deluxe is arguably the strongest title in the Switch’s library. Originally a Wii U masterpiece, the "Deluxe" port fixed the Battle Mode, included all previous DLC, and became the best-selling game on the system. However, the recent "Update 3.0" marks the completion of the Booster Course Pass, adding 48 new tracks and transforming the game from a "definitive" port into a massive, sprawling platform.
Updating to NSP XCI version 30 is relatively straightforward. Here's a step-by-step guide: mario kart 8 deluxe switch nsp xci update 30 new