Timesplitters owns my life. Well, a month after a new one comes out...
Timesplitters 1: The most origional, in my opinion. Dual weild MINIGUNS!
Timesplitters 2: Great, so much content. I played this one the longest.
Timesplitters 3: A bit too commercial, like a sell out version. Still, very fun, Duckman Drake lives on.
My favourite challenge is Behead the Undead. I could play that for hours... Especially on TS2. On TS3 they ruined the shotgun.