"With the latest updates included in the Pass, you get more than just tracks; you get gameplay balance tweaks, the 'Custom Items' feature for chaotic custom races, and a significantly more active online matchmaking pool." Note on "ROMs":
: Some ROM hacks include "LE-CODE" or similar patches to adjust vehicle stats, making more karts competitive for online-style play. Top Improved Track Examples mario kart 8 deluxe booster course pass rom better
published a comprehensive analysis of the Booster Course Pass (BCP). They detail how the DLC tracks differ from base-game tracks, focusing on simpler modeling, "clay-like" textures, and lower-quality cubemap reflections, which they attribute to the tracks originating from the mobile game Mario Kart Tour The Cutting Room Floor (TCRF) Wiki : For a deep dive into the ROM's internal data, the TCRF Mario Kart 8 Deluxe Page is the gold standard for "research". It documents: Datamined Leaks "With the latest updates included in the Pass,
: Friends who don't own the DLC can still play the new tracks if they join a lobby hosted by someone who does. Base Game (MK8D) With Booster Course Pass Total Tracks Playable Characters Extra Cosmetics Standard suits 17 additional Mii Suits Item Customization Full Item Toggle It documents: Datamined Leaks : Friends who don't