Lan? Still awesome.

For my kids' parties I have 3x OG xboxes. Each has 4 controllers. Plug them into a router.

12 player lan. Halo, Nascar, (6 player) crimson skies, mechassult.

https://www.teamxlink.co.uk/wiki/Xbox sort by per console and total players.

I promise they have vastly more fun all being in the same room playing each other all at once than anything with modern graphics.