I never even tried once , but other games such as poly , clam , bubble , candy game all also need to pay to pass by buying their special item with coin or i can said real money.
Funny is to pass the bubble in some stage , you really need to purchase special item with own coin but the redeem for 800 points up to today is just 80 coins or 80 cents ??? Same with candy , poly , clam game , You buy those special item cost even more than your redeem coins.

Anyway does the farm need to use own coin to buy special item ?