Massive Portal

The Massive Portal, known in Half-Life 2: Episode Two as Superportal, is a version of a regular portal that is much more massive than the regular portal. To date it's seen in Episode Two and indirectly seen in Portal.

The Combine Superportal was opened sometime between Episodes One and Two as the consequence of the destruction of the Citadel. It was shut down quickly, as seen at the end of Episode Two.

The Aperture Science massive portal was used by GLaDOS at the end of Portal to transport her and Chell to the surface of the Enrichment Center.