If you are a android/iPhone/iPad user and want to get free gems to recruit heroes than just follow the steps bellow. If you not a android/iPhone/iPad user but your friends have android/iPhone/iPad set just loan one set for one our and went to a free WiFi zone and Follow the steps.
First go your Facebook by PC and open Throne Rush.
Then a dialogue box will open like bellow and choose free 60-75 gems for just download and use android apps.
Finally Download those apps of those links from your inbox, use them for a while and get free gems.
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