This was a fun quiz. I think I can do reasonably well on this one.
Q1: Sly Cooper. The three main protagonists are Sly the raccoon, Bentley the turtle, and The Murray as the hippopotamus.
Q2: b) Nintendo PlayStation. Guessing this is a trick question. It's commonly referred to by this now, but perhaps it wasn't an official name during the partnership.
Q3: True. I believe there is a secret final boss, though I don't know if that name is correct or not.
Q4A: Tak
Q4B: Geralt of Rivea
Q4C: The World Serpent. Haven't played God of War, but this name sounds vaguely familiar.