True Area 53

True Area 53 is the true final Zone in Sonic Advance 2. It consists of a true final boss battle, which is fought as Super Sonic. True Area 53 can be accessed after the player defeats the final boss of XX with Sonic with all the Chaos Emeralds and beating the game with all the other characters. The boss is a different type of mech controlled by Dr. Eggman.

Eggman's mech has an appearance of a crooked-gun. It is mostly orange with some black and yellow stripes. Some of the lines are either gray or purple and it has orange headlights. An Egg Mobile is located on top of the mech's cockpit.

Super Sonic had to fight against the mech to free Vanilla and the captured Flickies (which were trapped inside a pod after being sucked inside the mech, as shown in the cutscene). The fight here is somewhat similar to that of Exception, from Sonic Rush.

Story
After losing to Sonic, Dr. Eggman found Cream's mother Vanilla in a meadow with some animals and used his mech to capture them while cloaked. Sonic, Tails, Knuckles, Cream and Cheese arrived just as Eggman flew away. Cream couldn't do anything more than watch as Eggman got away with her mother and cry. Sonic, seeing Cream in tears, uses the power of the seven Chaos Emeralds to transform into Super Sonic. Sonic slyly gives Cream a thumbs up and chases after Eggman.

Battle
During the fight, Eggman will fire missiles at the player. If the player uses Super Sonic Boost at the right moment, he will deflect the missiles back at the cockpit and damage the mech. Also Eggman will fire small energy orbs at Super Sonic's direction. At times, Eggman will fire a laser which will freeze Super Sonic if he is hit. If Super Sonic is frozen, a vacuum on Eggman's mech will appear to try to suck up Sonic. If it inhales Super Sonic, he'll lose some rings inside and be spit back out. Near the end of the fight, Eggman will perform a spin attack toward Super Sonic.

After the mech is defeated, the capsule will start to fall to the planet. Super Sonic then tries to stop its fall, but the capsule breaks and Sonic loses his Super Form and Vanilla is falling. Sonic tries to save her and manages to grab her hand just in time. Sonic makes a safe landing and Cream embraces her mother with tears in her eyes. While Tails and Knuckles watch the loving moment, Sonic runs off for another adventure.