Multiplayer: BF series specifically BF2 MC for 360 Single Player PC- The Witcher Series, Age of Empires Series, Command and Conquer series, Myst, 360-Dark Souls, Mass Effect series, Bioshock, and Borderlands PS3- Demon Souls, Heavy Rain, and God of War 3 XBOX- Halo, Star Wars Knights of the Old Republic series, Splinter Cell series PS2- God of War series, Shadow of the Colossus, Ratchet and Clank Series, Kingdom Hearts series, Socom Navy Seals series, Silent Hill 2, Metal Gear Solid series PS1- Threads of Fate, Silent Hill, Twisted Metal Series, Moncho, Fear Effect Series Metal Gear Solid, Gran Turismo series, FF7, Tomb Raider series, Medal of Honor, Crash Bandicot Series, and many many more. Sega Genesis- Sonic the Hedgehog series, Golden Ax, Streets of Rage series, Vector man
best multiplayer game i ever played is Halo 2 and it isnt close at all single player: Halo: CE KOTOR Mass Effect (until the final 30 minutes) Halo 3 Splinter Cell Age of Empires Roller Coaster Tycoon Command and Conquer: Red Alert 2 and Yuri's Revenge Civilization