Do bosses have health bars?

No. Each boss is beaten by filling its phases through a mechanic on the board.

Boss guide

How bosses work

Bosses have no health bar and never shoot: each one adds one board mechanic that changes where you want to stand. Fill its phases before the Audience runs out. Late risers are off during the fight. The six bosses are listed below with their mechanic.

Bosses

THE MOLE KING	SUNNY FAIRGROUND	His Royal Guards march down the board. The hammer only goes CLANG: knock their crowns off with reactions.
THE PHANTOM SHOWMAN	HAUNTED FAIR	The shell game: he hides under a top hat and shuffles. Follow the hat and pop it.
DJ MOLE	NEON ARCADE	The dance floor lights up to the beat. Pop moles on the lit tiles to blow his three speakers.
THE JUNK COLOSSUS	SCRAP YARD CARNIVAL	It throws scrap bridges and junk walls. Chain over the scrap into its armour plates, then crack the core.
THE CLOCKMASTER	CLOCKWORK CIRCUS	Its clock hands sweep the board and stop time. Pop moles under the hands to lock three gears, then strike midnight.
THE GRAND RINGMASTER	ROYAL GRAND FAIR	The grand finale remixes the fair: scrap bridges, the clock hand and the grand ring, in three acts.
MOLE ZERO	THE FORGOTTEN FAIR	The first mole ever drawn. Its fragments jump to the marked holes!
THE SHADOW RINGMASTER	ROYAL GRAND FAIR	The encore. Shadows of your own moles hunt the hammer: break them with reactions.