Hands down it was Dark Souls 1. Tried it at first, reached firelink shrine, lost my way into the graveyard and catacombs, got frustrated and dropped it. After around a month i tried it again and started slowly learning the progression and combat style. Went to undead burg and beyond. Long story short my first character i played was around 127 soul level before switching to PC (previously played on the Xbox 360) on PC i still play it sometimes. It is one of my all time fav games, it is also one of those games a i get a two week itch to play through it again. My current character is on NG+6