Sonic the Hedgehog (2006)/White Acropolis

This is a snowy level set outside a large base, most probably Eggman's, complete with many large buildings and searchlights. Sonic, like in Crisis City, has another snowboarding area here, which is a homage to the Icecap stage from Sonic the Hedgehog 3.
 * Sonic's Story (3rd Stage): After meeting up with Knuckles, and receiving a letter from Dr. Eggman threatening him to bring the Chaos Emerald he has, Sonic and the others set off to find Dr. Eggman's secret base, the "Aquatic Base".
 * Shadow's Story (1st Stage): Shadow journeys to Eggman's base in search of Rouge, who has sent an SOS call after trying to locate and recover the Scepter of Darkness.
 * Boss: Egg Cerberus
 * Silver's Story (5th Stage): Uncertain whether or not Sonic really is this fabled "Iblis Trigger", Silver and Blaze journey to Dr. Eggman's base in search of some answers.
 * Boss: Egg Genesis