Diablo 1
World of Warcraft (before it went kak)
Final Fantasy VIII
Arcanum
Morrowind
Planescape Torment
Baldur's Gate 2
System Shock 2
Half Life 1
Quake 1
Doom
Sonic
Super Mario Bros
Earthworm Jim
And the first time I could use 3D acceleration in a game... that was mind blowing at the time!!
Warcraft: Humans and Orcs - Multiplayer over Laplink (Serial) Cable!
Doom1 - Multiplayer over multi-linked Laplink Cable! (Serial1 in / Serial 2 out - 4 players - woot!)
And last but not least,
DukeNukem 3d - Multiplayer (with LAN ISA cards )