A critical "under-the-hood" update that addressed a security flaw in the game's netcode to prevent buffer overflow issues, ensuring a safer and more stable online experience.
The latest comprehensive update for on Nintendo Switch is Version 3.0.4 , which rolled out in May 2025. This update followed the massive Booster Course Pass expansion, which concluded with Wave 6, bringing the total course count to 96. Core Content: Booster Course Pass (Wave 6) Mario Kart 8 Deluxe Update -NSP-
An NSP (Nintendo Submission Package) file is the official format used by Nintendo to distribute digital games, downloadable content (DLC), and software updates through the Nintendo Switch eShop. A critical "under-the-hood" update that addressed a security
A Music Player was added to the main menu, allowing players to listen to every BGM track from the game. which concluded with Wave 6