Play as Akuma

This code is horrendously hard to get working, but at the character select screen pick "Super T" as your style then highlight each of the following characters in this order for three seconds: Ryu, T.Hawk, Guile, Cammy, Ryu. Then press start followed by all three punch buttons together. Akuma's picture should appear meaning that the code has worked. This playable version of Akuma is a lot weaker than the one you can fight, and only has single air fireballs, but he is still one of the most powerful characters in the game, so much so that he is banned in tournaments.

Fight Akuma

Akuma (known as Gouki in the Japanese version) is a hidden character you can fight against. To get him to appear, you need to play through the single player mode, but you cannot lose any rounds. When you reach M. Bison, Akuma will appear and kill him. Akuma will then turn his attention to you instead and you'll be in for the fight of your life. Akuma is extremely powerful and will do everything possible to stop you from hurting him. His fireballs can blast you back, he can teleport, he can throw two fireballs at you whilst jumping, he can perfectly counter attacks made against him with his dragon punch and he will usually always tech out of any throw. If you manage to dizzy him, he will recover almost immediately.

View credits sequence

To view the credits sequence, which features several characters fighting each other, beat the game. You may lose rounds, but you cannot use any continues.

View extra credits sequence

To see a different credits sequence, complete the game without using a continue or losing any rounds. You'll get a credits sequence, featuring a piece of artwork for each character (excluding Akuma).

Akuma's special ending

If you beat the game with Akuma without using any continues, you'll get to see a special credits sequence which shows each of the opponents you have defeated. You can lose rounds.

Points bonuses for perfecting the bosses

Usually, if you get a perfect (win a round without taking any damage), you will be given a 30,000 point bonus, But if you beat Balrog, Vega or Sagat with a perfect, you'll get 50,000 points. Beat Bison with a perfect and you'll get an 80,000 points bonus.