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Crystals are the primary source of income in Revenge of the Titans. Crystals are placed pseudo-randomly in each mission and need to be harvested by Refineries to generate cash.

Higher difficulty levels place crystals very near Titan spawn points; lower difficulty levels place crystals close to your base, out of the marching path of enemies.

Only 4 Refineries may work on a Crystal cluster at one time. The amount of crystals the cluster contains can be discovered by hovering over it.

Harvesting all of the crystals on a mission will earn the Efficient Medal, worth a bonus $500. If you do not harvest all of the crystals, you will scavenge 10% of whatever is left after the mission ends.

EfficiencyEdit

Extraction of Crystals can be enhanced with the following technologies and buildings: