After witnessing Eggman's test fire of the Eclipse Cannon, Sonic, Tails and Amy realize that he's been collecting the Chaos Emeralds to fuel the giant weapon. Tails remembers that the Chaos Emeralds attract each other, and decides to use the Emerald he received as a gift for saving Station Square in Sonic Adventure to find the others. The police find the trio at this point, and Sonic offers to keep them busy while Tails escapes to look for the other Emeralds.
Various sections of Mission Street is prone to earthquakes, which causes some sections of the bridges to collapse.
This section requires an expansion.
Level Up Item
Tails' Booster is located here, allowing his mech to hover. It must be collected in order to complete the level.
Collect 100 Rings
The first method successfully completing this mission is to take time. If the player is hit even once, it becomes almost impossible to collect 100 Rings. Additionally, before walking under the giant suspended Weight, the player should break the Wooden Container on the right and hit the switch to prevent the Weight from falling onto them. This stage has 104 Rings in Sonic Adventure 2 and 99 Rings in Sonic Adventure 2: Battle, so the player must use the back Ring to collect more Rings located at the end of the stage.
Find the lost Chao
As the player approaches the second point marker, they should turn back toward the screen and drop down. They must hover to descend slowly, and they will see a ledge below with an Ancient Ruin on it. Playing the Mystic Melody atop this ruin causes a blue swirl to appear: it transports the player to a row of floating elevators. The player must jump and hover between them to find the lost Chao.
Reach the Goal within 3:00
The key to this mission is to move constantly. If the player picked up the Laser BlasterLevel Up Item, they should use the Lock-On Missile as fast as possible throughout the stage to destroy any obstacles in their path.
Clear Hard mode
There are few changes to this stage's hard mode than the player is accustomed to. Extra enemies have been added as usual, but there are few structural differences.
First, the falling cylinders may blow out the road ahead before there is a chance to cross them.
There is also a new mechanism, the swinging iron balls.
The final section has different mechanics.
Chao Container locations
At the beginning of the stage, the first Chao Container can be found on the upper path past the falling highway.
At the beginning of the stage, the second Chao Container can be found among the Wooden Containers below the pillar staircase.
After the first Point Marker, the third Chao Container can be found among the Wooden Containers which are located at the back of the platform with the pair of Weights.
After the bridge with the collapsing pillars, the player must cross a large bottomless pit. While crossing the pit, they should be able to see Big on a support beam on the left side.
In Hard Mode, Big's location is moved to the furthest point of this stage. Before the Goal Ring, there is a collapsing highway above the arena. Once the player reaches it, a part of the highway will fall and reveal Big's location.
In the level, it is possible to knock over small three-wheeled cars, reminiscent of parking attendants in real-life San Francisco. The developers of the game occasionally were ticketed by these cars and allowed them to be destroyed in the game as a form of revenge. They have, however, acknowledged that the parking attendants were just doing their job.
Throughout the stage, the player can see electric billboards with Tails' head on them, offering a $1,000,000 reward for his capture. These billboards provide (non-detailed) descriptions of Tails. Apparently, G.U.N. has no records of Tails date of birth, location of birth, or his nationality.
There is an actual street in San Francisco called Mission Street.
The setting and many objects featured in the level are similar to Radical Highway, save for the city street sections at both the beginning and end.