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@MaybeSo ..This is why I have two swarm towers early on, you can upgrade them quicker at low levels. Also, try to send the waves before you're actually done upgrading and you can squeeze out some more bonus time.
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@lorne: Mostly what keeps me from getting above 7600 is waiting for air towers to upgrade and waiting for planes to die so I can upgrade ...
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I like to finish easy mode with a higher time bonus than score, or finish any mode with only a single pellet tower that kills the last creep :)