All modes and characters:
Hold A + B and press L, R(2), L(2), Up(2), R at the main menu. Note: You may need to repeat this two or three times before it activates.

Alternate costumes:
Press L, R, or Start at the character selection screen.

Switch fighters:
Press R at the versus screen in tag team mode.

Fight as Heihachi:
Successfully complete the game with all nine characters. Heihachi will appear next to Hworang and Paul at the character selection screen.

Team battle modes:
Successfully complete arcade mode as Heihachi to unlock the and Versus Team Battle options.