Play at Galaga during loading

After you see the number of ships you've hit on the scree, press the Select button. If you have 40 points, you can play the second stage.

Galaga : shoot quickly

Hold Triangle to shoot quickly.

Galaga : second player

While the game is loading hold Up + L1 + Triangle + X on controller 2

Galaga : restart Galaga

After you see the number of ships you've hit on the scree, press the Select button. You should hear a sound indicating it worked. You will now be able to replay that stage. Note: if you try this on the last stage you will be returned to stage one.

Play with Heihachi

I With any character, beat every character up to and including Heihachi without continuing.
When you reach the final stage, the boss is Devil Kazuya.

Hidden characters

Anna : beat the game with Nina
Armor King : beat the game with King
Kuma : beat the game with Paul
Ganryu : beat the game with Yoshimitsu
Lee : beat the game with Kazuya
Kunimitsu : beat the game with Michelle
P-Jack : beat the game with Jack
Wang : beat the game with Law

Play with Devil Kazuya

Beat the 8 stages in Galaga.

Character's demo

Enter the folowwing code at the title screen.

Kazuya : Up
Paul : Diagonal Up/Right
Law : Right
Jack : Diagonal Down/Right
Nina : Down
King : Diagonal Down/Left
Yoshimitsu : Left
Michelle : Diagonal Up/Left
Heihachi : L1 + L2
Lee : L1 + L2+ R1 + R2 + Up
Kuma : L1 + L2 + R1 + R2 + Diagonal Up/Right
Wang : L1 + L2 + R1 + R2 + Right
P-Jack : L1 + L2 + R1 + R2 + Diagonal Down/Right
Anna : L1 + L2 + R1 + R2 + Down
Armor King : L1 + L2 + R1 + R2 + Left
Kunimitsu : L1 + L2 + R1 + R2 + Diagonal Up/Left