There are plenty of nice old games that needed a main server to play online, sucks most of those servers are down. Age of Empires used to need microsofts zone.com for multiplayer but people created a client and put up a server and we still play (500+ players on the weekends).
Other games like Tribes and UT which anyone can make a server will be played for ages.
Favorites: big box Mac IIs, 950, 800's
Wanted: Anything Nubus, Video capture and editing hardware and software for 68k mac. Original software including A/UX.
Looking for 9150, Mac II, Color classic, 840av motherboard, and Nubus cards.