Hmm a game I would never sell...well I don't really have any of my original games from when I was a kid left so I guess I would have to say Shadow Hearts, Devil Summoner Raidou, Ace Attorney, and my Osu! Tatakae Ouendan games. Really there isn't much left I would consider getting rid of as I enjoy all of the games I currently own but those ones would be at the top of the list.