Street Fighter III: Second Impact Cheats

On the character select screen
go to Ryu, press Down, Down, Up
go to Ken, press Up, Up, Down
go to Ryu, press Up
go to Ken, press Down
go to Sean, press Down, Down, Up, Down, Up, Up, Up

Akuma's portrait should appear.

Beat Akuma with two finishing specials without losing losing a round. Akuma should leap up and the sky will turn dark and you will face Shin Akuma.

In the one player mode, you need to get at least 4 super art finishes and must not lose any rounds as you play. After your fourth super finish, the message "Your rival has found you!" will appear on screen and you will get to fight him/her. Each character has a different hidden rival.

Get three perfect victories.Akuma will come up with a raging demon to the boss you are fighting.Now you face Akuma.