Cobalt Plateaus

In Angry Birds Epic
Cobalt Plateaus is the second zone of Angry Birds Epic, In all levels (except Pig Prison, Southern Cobalt Plateaus, Western Cobalt Plateaus, levels after Matilda's Garden (in the older version, it's called White's Garden), and Eastern Cobalt Plateaus of all levels), you can only use Red and Chuck to complete all levels.

In Angry Birds 2
Cobalt Plateaus is an area in Angry Birds 2.