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I just made a new mod in the Source SDK. I saw online that there is an entity that allows portals to be created (linked_portal_door). However, I cannot find or create this entity.

Is it included in the base SDK or do you have to have an add-on. If it is not included, is there an alternative?

I am using Source Engine 2007.

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Per the documentation, linked_portal_door was added with Portal 2.

It sounds like your version of the SDK and toolset is too old to have it, and there is no alternative that I am aware of (the releated prop_linked_portal_door is also only available in Portal 2).

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