• Bonus options

Hold 1 + 2 + 3 + 7 + 9 + Option when the "Eye" appears on the title screen. | [Sent by DayleJ]
  • Fight against Carbon

Begin a game under "Hard" or "Killer" difficulty levels. Win the "Earthquake Zone" stage with a double flawless victory. This may be easily done by defeating the first opponent in the game, then intentionally lose and continue all other matches until the "Earthquake Zone" appears. Then, hit your opponent once, then block until the time runs out.l Carbon will appear in the "Subway Passage" stage. | [Sent by DayleJ]
  • Hidden Palace bonus level

Press # at the background selection screen. | [Sent by DayleJ]
  • Set sound and music options

Pause game play and press A, B, or C. | [Sent by DayleJ]

  • Subway Passage bonus level

Press * at the background selection screen. | [Sent by DayleJ]
  • Turbo

Hold 1 + 5 + 9 at the title screen. The word "Fight" will confirm correct code entry. A turbo option will now be accessible from the main menu. | [Sent by DayleJ]
  • Voice modem mode

Press 9, 1, 1 at the title screen. The word "Awesome" will confirm correct code entry. | [Sent by DayleJ]