Expert mode:
Highlight the "Die Hard Arcade" selection at the title screen. Hold X + Y + Z + B to begin game play with four credits and more challenging opponents.

Extra credits:
Play the Deep Scan game. A credit will be earned for the Die Hard portion of the game for every two submarines destroyed.

Hyper Deep Scan:
Highlight the "Deep Scan" selection at the title screen. Hold X + Y + Z and press Start. This version of the mini-game has more enemy submarines for greater difficulty. Credits earned in this mode can not be transferred to the Die Hard portion of the game.

Hyper Deep Scan X:
Highlight the "Deep Scan" selection at the title screen. Hold X + Y + Z + B and press Start.

Alternate soundtrack:
Highlight the Diehard Arcade selection at the title screen, hold X + Y + Z, and press Start.

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