The fastest method to earn gold

You need some upgraded strength. The stronger u are, the faster you can do this.

Play the BARBARIAN BOSS level, beat the poor boss, then destroy the gold chest, and try your best to get all of the money dropped on the ground.

My character strength is maxed out, It won't take more than 10 Secs to beat up the barbarian boss. But you don't need max strength.

You can easelly earn about 700 to 1000 or even more golds in less than 5 minutes :D