Drag to aim, lift to fire. Bank shots off the walls like a neon goblin with a geometry problem.
Drop a face into a cluster of three or more matching guards and they pop. Anything left hanging in the air falls.
Once a guard type is fully cleared from the level, it is gone for that level. No respawning. No little comeback tour.
American flag special: appears once per level and destroys up to 10 heads it touches.
Syringe special: appears three times per level and destroys up to 3 heads it touches.