Sonic Boom



Sonic Boom is an upgrade for the Boomerang Thrower that appears in BTD2, BTD3, BTD4 and BTD5. It can smash through frozen bloons but still cannot melt through Lead Bloons. Just for that reason, Bloons TD 2 states that Ice Towers work the best with Bomb Towers or Sonic Boom Boomerang Throwers nearby. The upgrade picture is of three yellow boomerangs gradually increasing in size. In Bloons TD 5, this is the first upgrade on the second path.

Trivia

 * In BTD2, a fully upgraded Boomerang Thrower (with Multi Target and Sonic Boom upgrades) works better with an Ice Tower than a fully upgraded Bomb Tower
 * In BTD5, when the tower throws the boomerang with this upgrade, a sonic wave can be seen briefly.
 * With Double Ranga, only one sonic wave is shown, even though there are two boomerangs being thrown.