This page contains Heli-Attack 3 Hints for PC - Windows called "Spark Plug gun" and has been posted or updated on May 22, 2007 by sonicman531. Let us know what you think of this Hint by thumbs voting.
Spark Plug gun
In level 1-3 there is a bridge. Hold [Modify] (default is [Space]) and [Down] on the right side of the bridge. You will drop down. Then, use any weapon on the right side of where you dropped down to break the five sections of the wall to unlock the Spark Plug gun.
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