Some gameplay changes can make a level easier or harder. Some stages were also slightly modified either gameplay wise or graphically.Since the game is run by a faster processor than its predecessor, the game does not slow down during hectic situations.Some sound effects were added during gameplay, such as the sound that is made just before the GUN Hornets fire their bombs.This was taken away in this version of the game. Eggman's stages, it used to be possible for their machines to receive damage even with a barrier shield. During Knuckles and Rouge's stages, a red exclamation point will appear when a player is right on top of an emerald/key.The secret character skins were also changed both in appearance and how they are obtained.A new character was added, Dark Chao and its Walker, in the place of Big the Cat.In it, the player can set a handicap, remove or enable a time limit, or set the traditional rules of VS mode from the Dreamcast. Also, special races were added such as the grind race and the shooting races. Dry Lagoon was also redesigned in 2 player mode to take place at night. More stages were made playable, such as City Escape and Dry Lagoon.The playing system was altered so that players are no longer required to play 3 stages in a row.Metal Sonic's attacks were completely removed and replaced with the ability to activate the Black Shield which defends against special attacks. Each character also received their own unique special attacks. For example, Chaos who had the same speed as Rouge in the original now has become much slower. Moreover, they were each given special stats that made each of them unique instead of just being clones of the main characters. All characters that needed to be unlocked with an A rank with specific characters are now available from the start.Example: Sonic can now fight against Amy Rose.

The players no longer have to choose a group making it possible for characters to face off against characters in their own alignment.

The 2P menu was completely redesigned with a different background tune.

It is most likely the inspiration of the term 'Battle' that is added to the title. The 2P versus mode is considered the biggest change between the Dreamcast and the remake.

Sonic adventure 2 battle rom