Bloonstones

Bloonstones  are a type of currency in Bloons Monkey City and its mobile counterpoint. Their appearance is of a blue gem shard and are obtained through multiple ways, including capturing a cave tile, and certain Special Missions, or by watching some videos (earns a varying amount of Bloonstones, not available to everyone). They can also be earned in the Wheel Of Fate by spinning each time the player levels up on Ninja Kiwi. Bloonstones in Bloons Monkey City Mobile are shaped like a bloon and are red like the red bloon.

They are also able to be bought via NK Coins in the Flash version or real life currency in the Mobile version at the Premium store. For each Ninja Kiwi coin, the player is able to purchase 5, though the more NK Coins or currency the player decides to spend, the more bonus Bloonstones they will receive.

Trivia

 * Currently, the cumulative cost to upgrade all monkey towers is (2,520 plus cash), and (140 plus cash) to upgrade all MvM bloons.
 * In Bloons Monkey City Mobile, Bloonstones look very different, as they look like a crystallized Red Bloon.
 * Occasionally, a player may accidentally press the Monkey Boost when actually trying to get a tower, especially in the case of BMCm. This may make the player waste a Monkey Boost.
 * Bloonstones are more difficult to get in BMCm, as only two are granted for completing a level with no lives lost, and there is no hardcore mode to double it.
 * Bloonstones are not needed to reseach 3rd and 4th tier upgrades in mobile, provided the player has a strong internet connection.