Mass Effect series, though ME3 I've easily spent 100 hours on the MP
Dragon Age: Origins
Pretty much every TES game I've played: Morrowind, Oblivion, Skyrim
Most Pokemon games: Red/Blue, Gold/Silver, Diamond/Pearl, Black/White, X/Y
Most Final Fantasy games: IV, V, VI, VII, Tactics, VIII, IX, X, XII (I replay them often)
Ocarina of Time (Another game I replay often)
Perfect Dark
GoldenEye 007
Super Mario World
Super Smash Bros. & Super Smash Bros. Melee
Mario Kart 64, Mario Kart: Double Dash
Minecraft
Civilization IV & V
SimCity 3000 & SimCity 2013
Pretty much every Sims game: The Sims 1-3
Ragnarok Online
World of Warcraft
Final Fantasy XIV
That's all I can think of off the top of my head o.o
Edit: MOAR
Fallout 3
Fallout: New Vegas
Halo:CE
Halo 2
StarCraft
StarCraft II
Total Annihilation
Runescape
