Bloonstones

Bloonstones are a type of currency in Bloons Monkey City. Their appearance is a blue gem. They are obtained by capturing a tile with no lives lost, which gives you 5 Bloonstones. They are also obtained by levelling up your Town.

They are also able to be bought via NK Coins at the Premium store. 1 NK Coin = 5 Bloontonium, though the more NK Coins the player decides to spend, the more bonus Bloontonium he gets.

Uses:

 * Finishing the upgrade of a building or an upgrade.
 * Buying City Cash.
 * Sending attacks when you don't have enough Bloontonium (40 Bloontonium = 1 Bloonstone).
 * Starting with $350 extra cash in a battle (10 Bloontonium).
 * Using a Continue (20 Bloontonium).