Missions are the core gameplay element of Save the World. Each Mission has a Main Objective and a variety of Side Objectives. Entering a Mission is the only way to gather resources, complete Quests, and craft/use Weapons, Traps, Heroes, and Defenders.
Mission Alerts appear on the Map as Missions with a Storm Vortex around them. These Missions have different modifiers which can buff or weaken enemies/players. Mission Alerts grant extra rewards, including Evolution Materials, Experience, Schematics, Materials, Gold, and rarely V-Bucks. Extra Rewards can be claimed once per Mission Alert, up to three times per day. Mission Alerts change every six hours.