Concept and creation
According to Takashi Iizuka, the reason why "[Sonic Team] wanted Dr. Eggman's Incredible Interstellar Amusement Park in space because it's so huge. The scale of it is so ridiculously huge that no planet could really accommodate it. [They] wanted to really show that his amusement park is so big that it has to be in space."
The park consists of five planets chained to the Egg Mecha, with a space elevator named Eggman's Ultra Accelerating Space Elevator to bring people up from Earth and vice versa. Eggman builds the park to "make up for his past attempts at world domination"; however, Sonic the Hedgehog does not buy into his speech, so he and Tails head for the park to see if Eggman is working on another plot. Sure enough, they later discover that he is capturing aliens called Wisps and using their special Hyper-go-on energy to power both the park and a giant Mind Control Cannon.
Thanks to the efforts of Sonic and Tails, the five planets that Dr. Eggman had chained together were released, and the main park was destroyed after Dr. Eggman's Mind Control Cannon backfired and created a black hole.
- Tropical Resort
- Sweet Mountain
- Starlight Carnival
- Planet Wisp (under construction)
- Aquarium Park
- Asteroid Coaster
- Terminal Velocity
- Game Land
- Options Satellite
- Egg Shuttle
- The Amusement Park bears a strong resemblance to the Death Egg II from Sonic the Fighters, as it is large mechanical planetoid with multiple round planets connected into it.
- There are supposed to be five planets chained to the park; but technically, Starlight Carnival is not a planet, and Asteroid Coaster is more than one planet.
- The advertisement poster's title reads "Dr. Eggman's Amazing Interstellar Amusement Park".
- According to the manual of Wii version, Dr. Eggman's Incredible Interstellar Amusement Park had been in development for several years.