Paper Mario: The Thousand Year Door
So much memories with this game. I remember I was on Christmas vacation for the first time in NYC with my family. I was 11 and we went to this huge game store with several floors. GC was my system at the time, so I was browsing the games and I just saw it in a "Best Buy" security case for $49.99. I didn't know anything about, but I knew it was a new Paper Mario and O had to have it. I didn't have my Cube on vacation, so I pretty much just stared at the game and manual on the ride home. The moment I got back I ran inside put it inside and fell in love with it.
To the memorable characters, who had their own little backstory. To the fun chapters, most notably World 4 and 6, to the writing which broke the 4th wall. It was one of my most cherished games growing up.