All players must be on the same version (3.0.3 or higher) to use local wireless or LAN play; different versions will disable these matchmaking features.
So where does “303” come from? The term originates from a designed for use on modded hardware (typically Yuzu emulator or a hacked Switch). The number “303” refers to the total number of "Quality of Life" (QoL) enhancements, visual tweaks, and performance optimizations bundled into a single, massive mod pack. update mario kart 8 deluxe 303 extra quality
The Update Mario Kart 8 Deluxe: 303 Extra Quality is a massive patch that aims to improve the overall gaming experience of Mario Kart 8 Deluxe. The update includes a wide range of enhancements, from minor tweaks to major additions, that cater to both casual and competitive players. All players must be on the same version (3