Sonic Adventure 2 is a 3D platformer featuring Sonic the Hedgehog and his rivals. It introduces two storylines: “Hero” and “Dark,” where players switch between Sonic and Shadow, respectively. The game focuses on high-speed platforming, action, and a variety of levels. It includes new gameplay mechanics like the Chao Garden, where players can raise and train Chao creatures. The game is known for its engaging multiplayer modes and a soundtrack that enhances its fast-paced gameplay.