Often called Rainbow Gems, these little fruits are the "Premium Currency" of the game. It is the most important thing in the game and the strength of your account depends on how you choose to use/invest these fruits.



The following is a list of the ways you can use your fruits (in no particular order):

• Reviving from a Defeat
  If a Stage would have defeated your team, you can pay 1 Rainbow Gem to heal your team back to full health and have another attempt at winning.
  This is usually not a recommended usage of a Rainbow Gem unless the island is truly unbeatable for your account and you want the unit that drops from said-island.
• Pulling or Rolling
  At any time, you can expend 5 Rainbow Gems to roll for a new Character at the Saloon. The Character will always be 3-Star or Higher. This is usually done on "Sugofests" which are events that boost the rates of rarer units.
  Most Characters that can be pulled/rolled are considered "Premium" units and are only available thru this method.
• Expanding Box Space
  If you're constantly getting a message after you finish a stage, your box space is full. As such, for the cost of 1 Rainbow Gem, you can increase your maximum box size by 5. A fairly useful feature that you'll definitely use throughout your game play
• Refilling your Stamina
  If you are rapidly finishing island after island, you may find you can run out of stamina. For the cost of 1 Rainbow Gem, you can completely restore your stamina. This will allow you to continue adventuring/farming.

So those are the main usage of the delicious Fruits you obtain. You will generally want to hoard them where possibly and invest them wisely.