In World 1, the head will choose a target adjacent to the Cage and fire a laser at his position. This will cause an explosion which damages and launches the player away from the Cage. The explosion has a slight delay, so players can avoid damage simply by strafing. The common tactic is to run around the cage in a circle while attacking it.
The launching caused by the blasts can prove fatal. In World 1-2, a solid hit will result in you falling off the platform into a lake of poison. In 2-1, a hit can knock you over a cliff to your death. In World 2-2, a hit will send you all the back to the bottom of an icy hill and possibly over a cliff. The head usually only attacks with the laser when players are close to the cage. Attacking with ranged weapons, while expensive, is perfectly safe.
In World 2, the head gains 2 new attack patterns. The first is a quick blast to each of the compass points around it (easily avoided by being slightly off to the side). For the second, the head will laugh before firing its laser in a full circle around the cage. This can be evaded, but make sure you have a safe space to dodge in to.
The cage itself has 1500 hitpoints, and when the cage takes 25% of its total health, the head will flinch and shake its head before resuming the attack. This serves as an interrupt, but there isn't much need for one other than to get a small breather.
- The prison guarded by a boss containing a servant at the end of the level is a nod to Super Mario World. As the last part of a world, Mario would have to travel through a castle, defeat the koopa, and be informed by the servant, Toad, that he has yet another world to go through.