During a game of Evacuation, as the Hunters attempt to save the colonists of Shear from the rampaging Monsters, map effects are added to each round. If the Hunters win, a map effect from the Favors Hunters list below is added to the next round, and vice versa.
In Defend mode, map effects only appear during Evacuation. If the Hunters win the fourth day, the Armored Turrets map effect is added in the next game of Defend. Armored Minions is in effect if the Monsters win the fourth day.
All but the Defend mode map effects can be added to a Custom game in Multiplayer and Solo, but only one can be selected at a time.