Sonic Adventure 2/Beta elements

The following are the early/prototype/beta versions of Sonic Adventure 2.

Sonic Adventure 2: The Trial
A demo/prototype of Sonic Adventure 2 which was released with Phantasy Star Online for the Dreamcast as a bonus disc. The only playable stage is City Escape with a slightly different instrumental version of the song playing as BGM. In this version Sonic wears his traditional shoes instead of his Soap shoes, the cutscenes' subtitles and also some of the sound effects are different as well. Some of the posters in City Escape are different and are promoting PSO. After finishing City Escape a trailer is played which lacks   Miles "Tails" Prower  and  Rouge the Bat  leading to the belief that they were added later in development.

Sonic Adventure 2 [Preview]
This preview version was sent to the press as a sneak peek to the game. One of the most notable differences from the final version is the menu screen which allows the player to choose between Hero or Dark sides. Upon selecting any of the sides the player can choose to play with any of the side's corresponding characters.

There is also a 2P vs. mode in this release. Upon selecting this mode the player can choose between 3 battles: Sonic vs. Shadow, Tails vs. Eggman and Rouge vs. Knuckles. There are some other differences in this version such as different sound effects, music tracks and voices.

This version seems to lack proper sound programming since the musics and voice clips are being played almost completely randomly.