Level 21 achievement

[Post New]by MrsWatermelon on May 29, 16 1:31 PM
The achievement says to "call every helicopter but never let one land. Also get three stars." I don't understand what this means--it's impossible to win without the helicopters, so you can't wait until the last minute, call them, then win before they land.

Anyone figured this out?

 
 
 
 
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