Survival mode:
Quickly press Up, Down, Left, Right, Left, Down, Up, B, A, Start at the Capcom logo.

Easy special moves:
While fighting in a single player battle, press Select. This will allows you to pull off special moves with easy movements. For example, as Ryu press Forward + Punch for the Fireball, and the Fireball move now does the Dragon punch. This makes the game much easier to play with the small D-pad.

Alternate costume:
Highlight a fighter at the character selection screen, then press B or R. In the Japanese version of the game, highlight a fighter at the character selection screen, then press A + B. 

Press A at the character selection screen to get the fighter's normal costume. Press B, L, or R to get an alternate costume for your fighter. Press Start to get your fighter's special costume. Note: Not all characters have all four costumes. 

In game-reset:
Press Select + Start during gane game play select for options to continue, change the button codes, or exit the fight.

Akuma (Gouki):
Accumulate 5000 vs. points.

Super Akuma (Shin Gouki):
Accumulate 9999 vs. points.

Secret modes:
Play single player mode to unlock secret modes such as survival and time attack.

Gallery mode:
Accumulate 8000 vs. points. Alternately, successfully complete the game under skill setting 8 without using any continues. Press R at the main menu to view character art in the gallery.

Hint: Akuma: Moves:

Fireball: Down, Down/Forward, Forward + Punch; can be done in air.
Fireball (easy): Forward + Punch; can be done in air.
Dragon Punch: Forward, Down, Down/Forward + Punch.
Dragon Punch (easy): Down + Punch.
Hurricane Kick: Down, Down/Back, Back + Kick; can be done in air.
Hurricane Kick (easy): Back + Kick; can be done in air.
Raging Demon: Back, Forward, Down/Back or Forward, Down, A + B.
Raging Demon (easy): Press A + B.
Shakunetsu Hadoken: Back, Down/Back, Down, Down/Forward, Forward + Punch.
Shakunetsu Hadoken (easy): B + Punch.
Shinku Hadoken: Down, Down/Forward, Forward, Down, Down/Forward, Forward + Punch.
Shinku Hadoken (easy): A + B.
Warp: Back or Forward + A + B.

Hint: Super Akuma: Moves:

Fireball: Down, Down/Forward, Forward + Punch (two times in air).
Fireball (easy): Forward + Punch; can be done in air.
Dragon Punch: Forward, Down, Down/Forward + Punch.
Dragon Punch (easy): Down + Punch.
Hurricane Kick: Down, Down/Back, Back + Kick; can be done in air
Hurricane Kick (easy): Back + Kick; can be done in air.
Shakunetsu Hadoken: Back, Down/Back, Down, Down/Forward, Forward + Punch (three times with Heavy Punch).
Shakunetsu Hadoken (easy): B + Punch.
Shinku Hadoken: Down, Down/Forward, Forward, Down, Down/Forward, Forward + Punch.
Shinku Hadoken (easy): A + B.