Fantendo - Game Ideas & More
Cropped map (team-annotated).jpg
Sonic Heroes 2 locations
Team name Member 1: Member 2: Member 3: Member 4:
Team Sonic Sonic Shadow Silver Scourge
Team Rose Amy Blaze Cream Vanilla
Team Underground Tails Cosmo Manic Sonia
Team Knuckles Knuckles Shade Mighty Ray
Team Archaic Mina Max Mach Sharps
Team Big Big Honey Marine Tikal
Team Chaotix Espio Charmy Vector Saffron
Team Covert Ashura Wechnia Nazo Covert
Team Dark Rouge Fang Bark Bean
Team Babylon Jet Wave Storm Hurricane
Team Badnik Scratch Grounder Coconuts Metal Sonic
Team Eggman Eggman Eggman Nega Chaos Emerl Metal Sonic II
Miscellaneous Tiara Froggy Fiona Fox Egg Pawn
Nic Tempest Megatox Guidashir
Underground does exist, and it can be found in real encyclopedias. You may read more about it here:

Underground is a location in the Sonic series. It has appeared in Sonic the Hedgehog 2 (8-bit) and Sonic Underground as Under Ground Zone and an independent underground appears in Sonic the Comic called Underzone.

Sonic Heroes 2

Several undergrounds appear in Sonic Heroes 2. The eponymous Underground, Underground Zone (west of Mystic Ruins North), is based upon its Sonic 2 carnation and includes lots of nooks and crannies making mammallian inhabitance theoretically impossible; though this does not stop the appropriately named Team Underground from using the place as a studio and place to hide in.

Mystic Ruins

Mystic Ruins, besides being the only location to appear more than once on the map, goes underground between the two locations. The two locations are usually disambiguated by "Mystic Ruins South" and "Mystic Ruins North". See also Mystic Ruins#Mystic Ruins Underground.

Aquatic Mine (Oil Ocean Zone/Metropolis)

Aquatic Mine is the sewer system of Metropolis which is accessable via Oil Ocean Zone; as a result, the only team to play this zone, Team Knuckles, have to traverse Oil Ocean just to infiltrate the mine to grab the Emerald shards. After Eggman attacked part of the city, the mine has not been functioning properly and the sewage has been flowing into Oil Ocean Zone ever since; the Metropolitans are blissfully unaware of this, they are only aware that something not only stinks, but does so in the most obnoxious way possible.

Jungle Zone

A third underground appears between Crystal Egg Zone and Electric Egg Zone. It is artificial; it was erected by Team Badnik.

Between Eggs

At the back of Electric Egg Zone, there are some tiles which cover an underground passage. This, having been crafted by Team Badnik themselves during their stay, has been mysteriously extended during the events of Sonic Heroes 2 through Aqua Planet Zone, Mecha Green Hill Zone, Sleeping Egg Zone and Gigalopolis; and later - after Team Sonic arrives in Electric Egg Underground - into Mystic Ruins North and into an actual passage in the underground itself. Although Team Badnik do not learn of this during their storyline, Team Sonic learn of it in theirs, and within minutes of Team Badnik discommunicating themselves from Electric Egg and visiting Crystal Egg Zone, Team Sonic are immediately down the hole and attack the underground itself after discovering reports of a racket in Gigalopolis.