This page contains Act Of War: Urban Defense Hints for iPhone - iPod called "Upgrading units strategy" and has been posted or updated on Nov 26, 2012 by ice-climber. Let us know what you think of this Hint by thumbs voting.
Upgrading units strategy
Keep in mind that you'll be able to upgrade all of your structures two times. In some cases it is better to upgrade existing units than build entirely brand new ones.
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