|This article is about gateways that require specific circumstances to open only once. For gateways that require specific weapons each time Samus wishes to pass through, see Door.|
Blast Shields of varying colors, shapes, and sizes block access to different areas unless Samus has the means to remove them. Once removed, the Blast Shield will often reveal a regular Door beneath, and will not reform. Usually a specific concussive weapon, set of conditions, or beam combo must be used to remove a Blast Shield.