Each mission begins with Chief, the leader of the Rock Raiders, presenting an objective for the player to complete. Most of the twenty-five missions require the player to collect a specific amount of energy crystals for completion, starting with a goal of five in the first set of missions and gradually increasing in later ones up to fifty in the final mission.

Some missions instead require the player to rescue trapped Rock Raiders, retrieve missing vehicles, or construct a specific building. Many missions have a limited air supply, which requires a Support Station quickly being constructed to begin purifying the air in the caverns. There are also eight training missions to teach players how to control the game and how certain units work. These can be accessed from either the main level select menu or a separate training missions menu.Īs the game progresses, an increasing number of hazards stand in the player's way. Natural hazards such as landslides, cave-ins, and eroding lava can devastate caverns and destroy any units caught in them. Rock, ice, and lava monsters eat energy crystals and attempt to destroy buildings to get to the energy crystals inside, while slimy slugs will try to suck power from buildings.Ī variety of creatures inhabit the caverns, some of which can be dangerous to Rock Raiders. Defensive measures like weapons, reinforcement, power paths, or electric fences can be used to defend buildings from creatures.

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