This page contains AirForce Delta Strike Hints for Playstation 2 called "Gradius reference" and has been posted or updated on Dec 6, 2006 by Laurenx. Let us know what you think of this Hint by thumbs voting.
Play an Earth mission with the Vic Viper to hear music from level 4 of Gradius. Play a Space mission with the Vic Viper to hear music from Gradius 2.
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