Egg Utopia is the seventh Zone of Sonic Advance 2. As with other Zones in this game, Egg Utopia consists of two standard Acts followed by a boss Act.
Set inside yet another of Dr. Eggman's space hideouts, Egg Utopia resembles Sonic the Hedgehog 2's Death Egg Zone slightly in appearance on the outside, which shows a fast-moving starfield above Sonic's world, though the inside is more similar to Flying Battery Zone from Sonic & Knuckles.
The gravity will change every once in a while, much like in Sonic & Knuckles' Death Egg Zone and Sonic Advance' Cosmic Angel Zone, providing a real challenge. The panels that indicate a change in gravity resemble the gravity switches in Crazy Gadget from Sonic Adventure 2. The outdoor areas are also very dangerous as they are filled with long stretches of bottomless pits.
The space station's interior is also host to a variety of other gimmicks often used in conjunction with the reverse gravity. Carts will catapult the player's character forward, much like the Speed Launchers found in Flying Battery Zone and Wing Fortress Zone; cannons can be entered from behind, which will then fire the player in the given direction once is pressed; vertical poles adorn the ceiling that the player can swing around on; platforms can be ridden down slopes and off of ramps; and finally, the overhead handrails return from Hot Crater.
||Geji-geji — Centipede bots that crawl slowly through the air between the floor and ceiling (doesn't appear in Easy mode).
||Mouse — A mouse Badnik that scurries along the ground, similar to the Technosqueek (doesn't appear in Easy mode).
||Spina — A Badnik previously seen in Sonic Adventure. Flies in place, spinning its blades.
||Stinger — Like the ones seen in Leaf Forest, this is the assault-type that will attempt to sting the player.
Special Ring locations
The following are the locations of the Special Rings for access to the Special Stage in Egg Utopia. Detailed maps featuring the Special Ring locations can be found here.
||An easy first Special Ring to get. Simply jump at the start before going outside.
||After the first outdoor section, follow the lowest-possible path until gravity flips and ride the next rail in reverse gravity. The first Ring is at the end of the rail.
||After the first outdoor section, follow the highest possible path for as long as possible, leading to a vertical pole with the second Ring to the right of it.
||After the first Ring, take the lower path and jump over the diagonal spring and spikes. The horizontal spring will lead down a path that leads to the second Ring.
||After Ring #2, head for the lower path and carefully grind the rail to safety. Before using the cart, grab the swinging bar to the left and swing to the left.
||Continue to take the lowest possible path, and jump through the rail. Running through the loop will lead to a diagonal spring that will lead to a Shield and the third Ring.
||From #3, head for the highest possible route and follow it, eventually leading to a handrail. Ride it all the way, and stop at the end.
||Continue to take the lowest possible path. Just before the next outdoor section, drop down to find the fourth Ring.
||After #4, take the lowest possible route and follow it, passing the Checkpoint and grabbing an Invincibility along the way. The fifth Ring is found after running up a wall and into spikes.
||After #4, continue to take the lowest path out of the space station while taking care not to fall. The next ring is above a loop, accessible after running up the quarter-pipe.
||After Ring #5, continue to follow the lowest-possible route. The sixth Special Ring comes after the rail after the final outdoor section.
||From Ring #5, continue onward and bounce up the diagonal spring cascade. Before hitting the third diagonal spring, do a Big Air Trick Action ( + ) for an extra boost to the sixth Ring.
||After Ring #6, continue onward to reach the final rail at the top. The final Special Ring is in the middle of the rail.
||Continue through the Act as normal, taking the lowest routes possible. When entering the cannon after the final outdoor section, fire when the cannon is pointing at an upward angle.