Sonic Adventure DX

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Game Gear games:
Each time you complete ten missions or collect Sonic Emblems, you will unlock a new Sonic mini-game. After unlocking the first mini-game, Sonic The Hedgehog, the "Mini Game Collection" option will appear as a play mode at the main menu.
Information in this section was contributed by Jonathan Dogey.

There are a total twelve Game Gear games. They are unlocked as follows:
Information in this section was contributed by OnyxAleins4u.

0 to 100 Emblems: One Game Gear game for every 20 Emblems.
100 to 130 Emblems: One Game Gear game for every 10 Emblems.
0 to 60 missions: One Game Gear game for every 20 missions.
Tails Adventure is unlocked for getting the other 11 missions.

The games are unlocked in the following order:
Information in this section was contributed by OnyxAleins4u.

Sonic 1
Sonic Drift 1
Sonic Chaos
Sonic Spinball
The order then varies from here onward for: Sonic Labyrinth, Sonic 2, Dr. Robotnik's Mean Bean Machine, Sonic Triple Trouble, Sonic Drift 2, Tails Skypatrol, Sonic Blast, and Tails Adventure.

Play as Super Sonic:
Complete the game using all six starting characters to unlock Super Sonic. Sonic will transform into Super Sonic after some time into the next game.

Play As Metal Sonic:
Collect all 130 Emblems to unlock Metal Sonic in trail mode.
Information in this section was contributed by PitLiteSpicker.

Play as Tails:
Controller two may be used for Tails after he is obtained during game play in story mode. Note: Shields, invincibility and extra life boxes have no effect on Tails if collected. Note: If Tails goes too far away from Sonic, he will appear next to Sonic.

Mission mode:
Successfully complete the game in adventure mode with all characters to unlock the "Mission Mode" option at the main menu.

Glitch: Flying Knuckles:
Repeatedly tap [Jump] (default is [Space]) to have Knuckles jump in mid air, glide for a fraction of a second, then jump even higher. With some practice you can go almost anywhere. This very useful for the Red Mountain level.
Information in this section was contributed by KoalaMeatPie.

Glitch: Glowing Sonic:
At Twinkle Park, charge up for the Light Speed dash. While holding the key (default is Z), jump in a bumper car. You will appear to be glowing. [Screenshot]
Information in this section was contributed by Nathan.