Rotation

Mission types with rewards given for completing waves&em;particularly Defense, Survival, Excavation, and Interception&em;rotate through pools "A" "B" and "C" from which a reward is given, depending on the wave. Typically, the pattern is two rewards from A, one from B, one from C, repeat (AABCAABC...). A potential rotation reward is given to players after completing 5 waves in Defense, 1 round in Interception, 1 successfully defended excavator in Excavation, or every 5 minutes spent in a survival mission.