[Vampyr]

Eh, I don't really think the game needs multiplayer, or that it would make it any better. A huge part of the game is the immersion and atmosphere, feeling alone in the depths of a dungeon. The only thing co-op would add to is combat, and it's the weakest part of the game.

Not to mention most of the puzzles just wouldn't work with two people.

I played a bit more last night, encountered a couple of legitimately tough puzzles. Also had to fight off about 10 spiders at once. I've still managed to not have everyone in my party die, at least.