As I had heard that PewDiePie was looking for a less action- and shooter-packed Co-op game, I'd suggest Saw and Saw 2: Flesh and Blood. These have nothing to do with shooting weapons and it's not that actionlike game. However, we can't do anything against that it's a single-player game..

So the threads that included the suggestion of these games have been already closed? And I must conclude that the slim-printed names in the games list have been suggested already.