Bloon Spy is a type of Bloon that appears in Bloons Monkey City Mobile. Unlike other bloons, bloon spies do not appear on tracks, but instead appear on paths in a friend's cities. Bloon Spies are Bloons wearing a sign showing a distorted version of a Monkey's face. 1 is awarded after a player pops the last remaining Bloon Spy in a friend's city.
Blue version of Bloon Spies appear during the Bloon Spy Invasion event in BMCM. Similar to the King's Easter Egg Hunt event, they appear in various locations inside the city from time to time and must be tapped on to collect intel, which stacks for several rewards, the last of which is three ancient Monkey Knowledge Packs (originally only one ancient Monkey Knowledge Pack).