Extra credits...
	Extra Deep Scan submarines...
	Fast Deep Scan submarines...

Play the Deep Scan game. A credit will be earned every two submarines destroyed. These credits will be transferred to the Dynamite Deka game.

Highlight the "Start" option for Deep Scan, hold X + Y + Z, then press Start.

Highlight the "Start" option for Deep Scan, hold X + Y + Z + B then press Start.