Eggman's Base (InstanceTopic, 8)
From Compile Worlds
Eggman's Base is the base of operations for Dr. Eggman and his numerous minion's schemes. Its location and size usually varies between games, but often it is a sinister looking, sometimes castle-like structure built from Eggman's mechanical genius. In rare cases, Eggman has two bases for Sonic to conquer, and sometimes, he has none. Also often is that Eggman's Base is usually the last zone in the game, and usually has the most variety of death traps or gimmicks to stop you. In many cases, it also has the best music in the entire game.
In non-canon material
In Sonic Taradiddles, Eggman's Base is located in the middle of nowhere, Death Valley. It is very large and castle-like, and not hard to miss, due to Eggman slapping his face all over it. Inside, many events transpire, but usually conversations between Eggman, Rouge, Shadow the Hedgehog, Kuri-san, and a number of retarded robots ensue.
Eggman's Base also serves as a large storage unit for any giant robots, vehicles, pylons and weapons the evil doctor and his voluptuous cohort can whip up. Many of Eggman's old broken down machines sit here as well, such as the Stupid Little Drill Tank, the Egg Saucer, and numerous Giant Egg-Bots.
Eggman's Base also usually happens to be the last and most dangerous place Sonic the Hedgehog and his friends must visit during any one Sonic fanon arc, particularly, the Crystal Orb Arc and all of the Sonic Riders stories. It also seems to be the sole provider of the Egg Dish cable service, which provides both analog and digital signals.