To beat the calamari boss you will a least need strong upgrades like tier 4, 5 or 6 for arms. The core tier 4 isn't very effective.(Dual blast on the laser core works effectively on this boss, if you have glass bloon popping research). One popular way to defeat this bloon is to purchase (snap freeze) on level 3-5. When you play the level and start to fight this bloon, the ability snap freeze is proven to be very powerful against the outer bloons which shield the boss, along with the "bumper bloons." You might have to forgo certain bloons which are frozen but the calamari boss and the entire level in general will be easier. The ineffective tier 4 arm upgrades on 3-5 are dual whips, fire arc, and ricochet rangs. The most ineffective one is dual whips, which glass bloons are immune to. The Ca