There are probably a lot of people here that know about the half life series by Valve, but only the hardcore players know all the secret connections of the games. This post is for people who have played...
•Half-Life
•Half-Life 2
•Half-Life 2 Episode 1
•Half-Life 2 Episode 2
•Portal
•Portal 2 (preferably the DLC too)
Just post if you caught onto any tiny correlations between the games and any theories that you have to share with the community, thanks!