Street Fighter Alpha 2 Cheat Codes for Arcade

Secret Stages
To fight in a Grassy Area, at the Player Select screen, either player should press and hold START. Move the cursor to Sagat and keep it on him for five seconds. Then go to any character, release START, and press any button.
To fight at the Waterfall, at the Player screen, either player should press and hold START. Then move the cursor over to M.Bison. Then go to any character, release START, and press any button. You will fight at the Waterfall.

Chun-Li's Original Outfit
At the Player Select screem, press and hold Start and move the cursor to Chun-Li. Leave it over Chun-Li for five seconds, then press the following buttons for these color outfits:

Blue: Any punch button
Green: All three punch buttons
Black: Any kick button

Play as Evil Ryu
Enter this code on the character select screen. Go to Ryu, and press START. Now go to Adon, Akuma, and Adon. Return to Ryu and hold START for five seconds. While still holding START, press any punch or kick button to enable Evil Ryu.
Here are his moves:

Fireball: QCF, p
Dragon Punch: F, D, DF, p
Hurricane Kick: QCB, k
Teleport: F, D, DF, 3P
And his Supers:

Shinku-Hadouken: QCF, QCF, p
Super Hurricane Kick: QCB, QCB, k
Raging Demon: Jab, Jab, F, Short, Fierce
Super Uppercut: QCF, QCF, k