Want to play some MKWII multiplayer?
Second Week Uncreative Name Edition™

LIVE ROOM TRACKER:
https://kevinvg207.github.io/rr-rooms/

You need:
https://wiki.tockdom.com/wiki/Retro_Rewind
>Retro Rewind is a custom track distribution created by ZPL. It features every retro track from Super Mario Kart to Mario Kart 7, as well as some Mario Kart 8, Mario Kart Tour and Mario Kart Arcade GP tracks. As of v6.1.3, it also contains a custom track distribution with 80 original designs
>The distribution also features its own Homebrew application, auto updater and custom online server.

And either dolphin on your PC or a modded Wii / WiiU(vWii):
>How to mod a Wii?
https://wii.hacks.guide/get-started
>How to mod a WiiU?
https://wiiu.hacks.guide/
also a great guide in general for wii modding if you're interested in homebrew and want some use out of your old console.
(want to play without a disc? try the link in this: https://dpaste.com/EVFK37HJX)

>How to play on PC?
https://wiki.dolphin-emu.org/index.php?title=Installing_Dolphin
then follow the tutorial on the retrorewind link for dolphin
(having issues with dolphin after trying the guide on the link? try this guide: https://dpaste.com/AKV64WQ93)

>HOW TO JOIN / MAKE ROOMS:
Want to make some rooms for you and anons to play?
Go to "friends", "Register a Friend" and add the friend code of the host. Press a and then b to back out to the wifi menu, then go back to "Friends", "Find a Friend" and click them. You should now be in the lobby and should wait for others. Eazy! Btw for anyone wanting to make a open lobby in this game, just go to friends, and press the + button. read the message and select ok. just post your friend code in the thread and others can join.
(note: if it says "unable to join" the lobby is currently racing, you need to wait some minutes for the races to finish and the lobby to open again)