Mario Kart World has a hidden LAN Play mode that can be unlocked from the very first gameplay session. However, this hidden multiplayer feature is unlikely to see much use outside of Mario Kart World tournaments.
As the name implies, LAN Play is a mode that enables Mario Kart World to be played over a local area network. Instead of each console connecting to the others via ad-hoc Wi-Fi, this mode allows players to link all devices to a single router, either via Ethernet cables or wirelessly. Numerous games for the original Switch supported LAN play, including Mario Kart 8 Deluxe.
The multiplayer feature has returned in the critically acclaimed Mario Kart World, although it doesn't make its presence obvious. As noted by Reddit user Howwy23 and confirmed by Game Rant, enabling LAN play is as simple as opening the main menu, selecting Wireless Play (without confirming), and pressing the left analog stick while holding the L and R shoulder buttons. This input changes the selected option to LAN Play. The same button combination reverts it back to Wireless Play.
In LAN play, a maximum of two people can play on a single Switch 2, compared to...