Area Room Category Name Difficulty Video
Crateria West Ocean All Gravity Suit Backdoor (Bowling skip) Intermediate Video
It is possible to enter the Gravity Suit room from the back door using Grapple to get stuck inside the wall and then doing a Crystal Flash to force-stand. After that you can X-Ray climb up into the door transition.

Note that this still requires Phantoon to be defeated, otherwise Gravity Suit will not be spawned at its location.