Street Fighter Collection 2 Codes -

Secrets:
The Main Menu has a "Collection" section which lists a secret box for all three versions of the game. Successfully complete regular arcade mode with any character, on any difficulty setting. Then, save the game from the options menu to unlock the secret boxes. The secret boxes will turn into the following:

The World Warrior
18 new pieces of artwork to view.

Champion Edition
22 new pieces of artwork to view.

Turbo Hyper Fighting
Sound test of the game's music.

Sound remix option:
Successfully complete each game in arcade mode to unlock a sound remix selection at the bottom of each game's option menu. Turning on this option for "brighter" music and sound effects that are more reminiscent of the Super Street Fighter Series.

Deluxe versus mode:
Successfully complete all three arcade modes (saving after each time), to unlock a new "Deluxe Versus" mode at the main menu. This mode allows a two player versus game using any character from any version of the game against any other character. Example: Ryu from World Warrior up against Ken from the Turbo edition. A handicap may also be selected; up to eight in game speed; number of rounds, stage selection and sound remix.

Strongest CPU battle:
Successfully complete the game without using continues under any difficulty setting. A new CPU Battle will appear, in which the opponents are much stronger than before.