Spawners are enemies in Geometry Wars 3: Dimensions. They only appear on the levels of Spawn and Spawners Revenge in Adventure Mode. They have a circular shape and change from red into green. They can generate enemies around them unless destroyed.
Spawners first remain red at the beginning of their life and cannot be destroyed until they spawn enemies around them and change green. As they remain in this green state, they cannot spawn any enemies during and can now be destroyed. If not destroyed for a while, they will return to their red, indestructible state, and spawn the same type of enemies they did previously, but in bigger numbers.