This mod brings together content from the cancelled Half-Life 2: Episode 3, and Half-Life 2: Episode 1, with more updates to come.
'Dog Gates' Hub Map
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Description
Created by Valve in November of 2012. Demonstrates a small "story" in which the player has to rescue D0G from a Combine cell, and then work together to free Alyx from behind a red forcefield.
The original idea was to put Dog in a cell where Alyx was healed by Vortigaunts after the great defence?