Hot Shelter is the interior of Dr. Eggman’s giant flying ship called the Egg Carrier, which contains huge machine rooms that keep the ship flying and activate its mechanisms, a large aquarium for rare fish species (and also a special frog that holds the tail of Chaos, a monster important to Eggman’s plans), and a giant transit channel through which gravity trains move at breakneck speed to transport robots and resources.

Hidden deep within the Mystic Ruins, the Final Egg is Dr. Eggman’s gigantic base, full of deadly mechanisms, hostile robots and bizarre machines that perform a variety of functions. This is where new robots are created from captured animals, where the Egg Carrier, Robotnik’s flying base, takes off, and from where all the villain’s forays with purposes known only to him take place.

The ancient temple of the extinct Knuckles Clan, Lost World is an underground and above-ground sections of a huge temple, located mainly under the altar pyramid in the center of Mystic Ruins. Once upon a time, it was around this pyramid that the Knuckles Clan settlement was located, from where the echidna members of the clan raided other peoples and settlements. The interior of Lost World is a dark temple corridors filled with a huge number of traps and riddles.

Located on Dr. Eggman’s giant flying ship called the Egg Carrier, the Sky Deck is part of the ship’s outer shell, conditionally passable. Most of Sky Deck runs under and over the wing of the Egg Carrier, full of enemies, traps, and deadly cannons, without even thinking about such basic dangers as tremendous altitude and high winds. The smaller part of Sky Deck, on the other hand, runs directly over the main section of the ship, from where you can access the bridge. In this part there is a control lever that can be used to steer the Egg Carrier, thereby changing the gravity on the Sky Deck itself.

Located somewhere on Angel Island, Red Mountain is a huge volcano that extends to great heights and is surrounded by an entire mountain system. The heights of Red Mountain and the interior of the volcano are full of buildings and machinery, apparently built by Dr. Eggman’s robots, probably to extract the resources he needs. These buildings make it possible to move around the mountainous terrain, as the once unconnected mountain system is now filled with elevators, zip-lines, and bridges.

Located in densely populated Station Square, the Speed Highway is positioned directly above the skyscrapers of Station Square business district, allowing residents to get around the city in the fastest possible way. As a speedway, the Speed Highway offers a surprising number of unsafe and sometimes impossible twists and turns that flip in and out 360 degrees without giving the occasional driver a chance to save his stomach contents.