Advance to level 4
Link two Game Boys with a Double Dragon and a Double
Dragon 2 cartridge. Turn on the Game Boys and press Start at both
title screens. On Double Dragon, select two player mode and press Start.
Disconnect the Game Boys, then play Double Dragon 2 until the
player one continue message appears. Press Start to advance to
level 4.
Gameshark codes
Unlimited energy:
013CB7C6
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