The entire portal series, both TF games (Never played, looks like a good game), all CS games, all Half-Life games (Never played), Eternal Silence (?), pirates vikings & knights II(?), Dystopia (?), Synergy (?), Age of Chivalry (?), Zombie Panic Source (?), MW2, Spacewar (?), DOD:Source (Never played)
That looks like CSS, DODS, HL2DM, TF2, CSGO to me.
And if you want to tell me thats wrong, I read it off my bans list.