This page contains Heli Attack 3 Hints for PC called "Soundwave gun" and has been posted or updated on May 22, 2007 by hdsetiawan.
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On level 3-3, go to the second metal bridge and use [Modify] (button can be found in pause menu, which is P). Do it again and you will land on a third bridge very low down. Shoot to the right as far as you can go, then shoot up. You will find the Soundwave gun.
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