Besides earning coins by progressing through the game you can also get free coins by doing the following actions. Review the game on its official app store page share it through Facebook or Instagram to earn coins. Invite five friends to the game. Complete a free offer inside the game.
Instantly unlock levels
Normally you need to complete the current level then wait 32 hours before the next level can be unlocked. To bypass this requirement, complete a level, then advance the time on your device by 32 hours. After the next level has been unlock, set the time back to its correct value.