Mass Effect & The Walking Dead
I remember playing The Walking Dead Season 1 & 2 over 2 weeks and just being so engrossed in the story I would find myself thinking about my actions and what might happen whilst in my lectures lol.
Mass Effect 1 I stumbled upon by mistake. I played for an hour and thought I would get over the sci-fi business since im not normally a fan of sci-fi.
2 months and all three games later, I am so glad I stumbled upon it:P