Mario Kart 8 Deluxe Booster Course Pass ROM " refers to the unofficial distribution of the game's massive DLC expansion for use on PC emulators like
The neon glow of the Mario Kart 8 Deluxe title screen flickered against the peeling wallpaper of Leo’s bedroom. He wasn't playing the version everyone else had. He was playing the "Circuit Breaker" build—a rumored, leaked ROM of the Booster Course Pass that supposedly contained tracks Nintendo had scrubbed before release. mario kart 8 deluxe booster course pass rom exclusive
Whether purchased digitally or played via the physical cartridge, the Booster Course Pass provides content not available in the base game: 48 Additional Tracks Mario Kart 8 Deluxe Booster Course Pass ROM