What is the one game that serves as your absolute center?

By that, I mean the one game that you play and it brings you back to what you feel completely resonates with you. The one game that when everything feels all out of whack, you can play and it brings you to feeling like yourself.

Mine is Chrono Cross. I got it when I turned 14 and right before I went into high school, which was obviously a time of profound change. It was a really new and exciting time of new and crazy changes, meeting new people, some of which would change my life forever, and some who I still would consider my best friends and brothers. It was before the time of things getting complicated and truly before real life. It was also in the last year of my life when my grandpa was alive and before 9/11, which feels like lifetimes ago. When I play Chrono Cross, it just seems to bring me back to that time in my life. Everything just seems pure again.

What game do you use to escape and feel like things used to be?