Colosseum Highway Zone

Colosseum Highway Zone is the second zone in Sonic Rivals. It is a ruin in the desert that has numerous loops throughout the stages and is located on Onyx Island, a future version of Angel Island brought to the present by Eggman Nega.

Overview
Colosseum Highway is an area that is heavily inspired by Ancient Roman architecture, and features large centurion statues, Doric columns, aqueducts, antiquarian villas, and active fountains. Some plantlife is also present such as Manicured trees and ivy creepers.

While many parts of this area appears to have been affected by the edge of time, such as a few headless statues and some half-crumbled structures, most of the course remains surprisingly intact. In addition, at the end of the course is a catapult that will send you hurtling to the goal, which is reminiscent of the Sand Ruins stage from Sonic Riders and there are numerous loops throughout the stage.[31] [32]

Sonic and Silver
After overcoming the Egg Turtle, Silver still tries to question Dr. Eggman about Eggman Nega (not knowing it is Eggman Nega disguise as Dr. Eggman), but "Dr. Eggman" says that he will only tell if he can beat Sonic, who had just arrived at the scene to take Tails and Amy back, which "Dr. Eggman" had turned into cards. Silver, while introducing himself, does not intend to let Sonic get in his way to "Dr. Eggman", but Sonic gladly accepts the challenge and the two race after the Doctor.

Shadow and Knuckles
After Shadow defeats the Egg Turtle, Shadow thinks about why Dr. Eggman claimed he did not call for his help, despite doing it 6 hours earlier, and decides to leave, thinking it is a waste of his time. Suddenly however, he receives a brief call from Rouge who tells him to keep following "Dr. Eggman". As he is about to head out however, he meets Knuckles, who also seeks Dr. Eggman, suspecting he had stolen the Master Emerald and just had a battle with him, but lost him when he escaped. Shadow then mocks him for letting Dr. Eggman get away. Enraged, Knuckles challenges Shadow to a race to see who catches Dr. Eggman first.