Bonus rounds

In Firefight, bonus rounds are a 60 second round at the end of each set. The skulls Iron, Tilt, Famine, and Black Eye are turned on. The points you recieve are either double or tripled the standard amount. Bonus rounds only end when time has run out.

Trivia

 * Each firefight game variant generally uses grunts as the only enemy in the bonus rounds.
 * Gruntpocolypse could be described as a five waves of a bonus round.