This music plays in the VERY first level, and gives you Tobias' tragic past. (The cutscene after the main level shows elements from Changed, but does show the exes in the U.S. killing off anybody who's fighting back and demonizing them to ensure that the exe army is growing at a steady rate.) The level contains a total of 2 rings, and lacks any real way to get hurt, making it ideal for testing grounds for things such as mods. The goal is to be seeked, but you are free to explore the zone. Beating the game will unlock level select, and allow you to come back here as often as you'd like to test out mods 'n stuff.
Music: Area Map: Aquarium Park - Sonic Colors (Wii)