Psychonauts: It has a charm that can't be beat, and I played it at a time in my life that was... unpleasant, to say the least. When I think of Psychonauts, I don't just remember a game, I remember an experience that genuinely helped me through one of the roughest patches in my life. Oh, and the gameplay and writing were both brilliant too.
Bully: It's my all time favourite Rockstar game, which is saying a lot. Not only is Jimmy one of the greatest protagonists in video game history, being perfectly balanced between thuggish and kind-hearted, the supporting cast and setting is absolutely wonderful. Bullworth genuinely feels alive and vibrant despite how bleak it looks at a glance, and seeing your favourite character walk down the street for the first time is a great moment. The quests are fun and varied, the pacing is excellent, the gangs are diverse and amusing, and there's plenty to do outside the story mode.