This is a short playable demo made exclusively for Japan by Sonic Adventure for the Sega Dreamcast. The title screen has extra text at the bottom which translates to Taikenban and certain levels have been made easier.

Sonic is back to save the world in his biggest adventure yet. The mad scientist Dr. Robotnik has found a way to harness pure evil from the chaos emeralds and destroy the world. Joined by friends new and old, Sonic must keep Dr Robotnik from obtaining all seven emeralds and unleashing Chaos on the world. Sonic makes his debut to the Dreamcast in a full 3D world of visual splendour, providing a thrilling experience.