Playing Left4Dead2 versus with 8 friends, running my own custom ‘Random’ mod. That game was so great to play matches in with the right people - and very fun to code sourcemod plugins for as well.
Left 4 Dead 2 (multiplayer)
CloneHero/GuitarHero
Quake 3 Arena (or 2, or DooM for nostalgia points)
Honourable mentions: Disco Elysium, Nethack, Portal.
Playing Left4Dead2 versus with 8 friends, running my own custom ‘Random’ mod. That game was so great to play matches in with the right people - and very fun to code sourcemod plugins for as well.