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Skirmigeddon plays similarly to Gruntpocalypse in that players face massive hordes of Skirmishers and no other enemies. Unlike Gruntpocalypse, Skirmigeddon takes place over only five waves. The objective of the game is to survive every wave until all enemies are defeated. Players are given the typical loadout of Designated Marksman Rifles and Magnums along with a set of armor abilities. Skirmegeddon is one of the most difficult Firefight gametypes on Heroic and Legendary due to the Skirmishers' rapid movement and precision; in such numbers they are capable of overwhelming a player in a matter of seconds.