Sometimes throws a flash bomb that stuns bloons in a large radius.
~ In-game description
This is the third upgrade of path 2 for the Ninja Monkey. It can stun and pop up to 60 bloons. This upgrade is not recommended for popping camo lead bloons, unless it's the only way on a daily challenge, due to the cheaper cost of the Monkey Apprentice, and the Monkey Apprentice's faster firing speed. It turns the ninja dark gray with a red bandana.
  • Flash Bomb Ninja Official Artwork
  • Ninja Monkey with Flash Bomb Upgrade
  • Ninja Monkey throwing a Flash bomb
  • Flash Bomb Icon
  • Flash Bomb icon in Bloons Monkey City
  • Flash Bomb Ninjas vs Ceramic Bloons in Bloons Monkey City Mobile (click for better view)
  • Stunning bloons with Flash Bomb (by black-clothed ninjas)


  • This is the only upgrade for the Ninja Monkey that can allow it to pop Lead Bloons.
  • The bombs can pop Black and Zebra Bloons.
  • Approximately every 3 Shurikens that the Ninja Monkey has thrown, a Flash Bomb is thrown. This stays the same even when upgraded to Sabotage Supply Lines.
  • It is equally expensive as the Bloonjitsu Master (however, Bloonjitsu Master requires buying Double Shot) yet not as effective in general. However, one could argue that its ability to pop Lead Bloons makes it slightly more useful.
    • For some, the stun effect is how the price is worth it, through, while not as efficient as Bloon Impact, it can hold off until the user can buy it. However, Bloon Impact needs some camo support while this doesn't need any.
  • In Flash, the bomb has a unique sprite. But in the mobile versions, the bomb sprite used for the Bomb Tower is used for this upgrade.
  • This makes the Flash Bomb especially useful in BTD Battles, as the opponent can send in camo leads on Round 12 (of course, that's just for starters. Other upgrades cost a lot less.)
  • The stun effect is recommended on tracks like Death Valley and Scorched Earth where stalling is of much importance.
  • The bomb pops up to 60 bloons (more than a bomb tower).
  • In Mobile versions of the Bloons TD series (BTD5 Mobile, BMC Mobile, BTDB Mobile), the Flash Bombs do not look like stun grenades at all, but they look like large 1500s-era-type bombs.