All Half-Life games
All Counter Strike games (excluding CS:N and Japanese ripoffs)
Gerald's Mod (4000+ hours on it, this is unhealthy)
Halo 2, 3, ODST, Reach and CE.
Call of Duty Modern Warfare Remastered, original COD4, MW2, MW3, BO2, BO1, WaW (FUCK BO3 AND AW AND IW)
World of Tanks
World of Warships
EDIT: Maybe a little bit of Bad Rats too and Garfield Kart.
EDIT2: Holy jesus I scroll up and I see many titles I have forgotten about. Putting them below.
TimeSplitters 1, TimeSplitters 2 and TimeSplitters: Future
Legend of Zelda - Skyward Sword (yes the Wii)
Legend of Zelda - Spirit Tracks
Persona 3 (never played Persona 4, for proof that i've played it I know about 80% of the characters properly)
Samus games
The $1 Dollar Zombie Game (xb360 indie title)