Fifa, MW:R, Blackout could all be fun to do 🤔 I’d even be down for the actual BO4 multiplayer 😅
Edit: As for formats... Depends on the game I’d say. Could do the good old knockout way, or some kind of league I guess? Singles or teams of 4? I seem to remember us doing a Bo1 tournament back in the old B4B days where we ran teams of 4 in a knockout tournament.