Confidential Mission Codes -

Unlock all modes:
Hold L + R + A + Y + Start + Left before demo mode begins. After demo mode ends, release Start at the title screen then press Start again.

Alternately, and hold Start + L + R+ A + B + Y + Right + Analog-stick Left on controller B during demo. After demo mode ends, release Start at the title screen, the press Start again.

Level select:
Successfully complete the game under the easy difficulty setting with the good ending.

Another World option:
Successfully complete all training mode sections. Note: This also allows your characters to appear with Dreamcast lightguns in the regular missions.

Additional training levels:
Successfully complete Another World mode to unlock more training levels in Agent Academy mode.

Gold guns:
Successfully complete Agent Academy missions one through eighteen.