After watching the complete video ad, close button(x) doesn't work and if I press back button(that too after watching it completely), I won't get rewards. Bugs Bugs Bugs. Perhaps, raise an event or set a flag after the ad has been watched completely so that if the close button fails you have fail-safe solution and the player will get rewards on pressing back button. OR Just fix the close button. It's not an ethical way to earn if you don't reward the players for watching ads.