Sonic Adventure for the Dreamcast is holy
The game came as close to perfection as we can get, albeit the awkward camera angles and the frustrating run sequences.
But SA2 will always hold a special place in my heart. It intrduced the amazing chao world, Shadow and some other amazing game aspects. But the battle mode was horrible. The first SA has so much replay value and the story is actually good and entertaining, I love how you can roam around the city, plus I remember the very first DLC it offered through sega's servers.