While your primary objective often consists of destroying an enemy base, you can get extra stars by beating levels quickly and defeating a specific number of foes. Like many mobile titles, "Thor: The Dark World" uses a three-star rating system that encourages you to replay each stage.
Each enemy has different strengths and weaknesses, so you'll have to summon different types of Einherjar and adjust your play style in order to finish each stage optimally. You'll encounter a variety of enemies from the film, including Marauders and Rock Giants. This energy can be used to deploy up to six helpers at a time, so you’ll have to keep a close watch on your resources as you hammer away at foes. Throughout the fight you’ll notice a blue meter at the bottom-left of the screen that stores your mana, or magic power.
You'll also unlock a variety of special allies throughout your quest, including Asgard gatekeeper Heimdall and Thor's lovably menacing brother Loki. Thor may be a powerful deity, but he doesn't fight alone in "Dark World." In the midst of battle, Thor can summon Einherjar, which are a mix of Asgardian assistants with different specialties, such as long-range and close-up attacks.