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Pro Free version available for testing purposes
There is a free version of Quadcopter FX Simulator available on the Play Store for those that would like to test the game before they purchase it.
Pro Upfront paid app with zero in app purchases
Quadcopter FX Simulator Pro is a full upfront paid app that costs $4.99 and has zero in app purchases. Meaning, once the app is paid for there will be no other transactions, which for this particular genre is refreshing to see.