Hole io

This method is for those who want to get this done quickly. After saving up around 33,000 coins, close your game. Then open it back up and go to the power up and buy every upgrade, then wait a few seconds and hit the home button but do not close your game. Instead go to game management and delete your local save data (console). Then boot the game back up and you will have all your coins again for the next upgrade of your choice.

U have grind a lot coins like 25000 for last upgrade for all them