Sonic Adventure - Sega All Stars for the Sega Dreamcast is an iconic platformer and the first major 3D entry in the Sonic franchise. Released as part of the Sega All Stars lineup, the game follows Sonic the Hedgehog and friends as they battle against the malevolent Dr. Robotnik, who seeks to unravel the power of the ancient water creature Chaos. It featured expansive, multi-path levels, a variety of playable characters each with unique abilities, and a pioneering open-world structure known as Adventure Fields. Its vivid graphics and dynamic gameplay solidified its legacy in the genre.