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Portal 2 Black Mesa Reference
Portal 2 Easter Egg - Black Mesa Reference
GLaDOS Half Life Reference "Things have changed since the last time..."
All Half Life references in Portal
How Are the Portal and Half-life Games Connected?
Cave Johnson talks about Black Mesa in perpetual testing initiative
GLaDOS References The Combine/Xen/Resonance Cascade
Portal 2 References in The Perpetual Testing Initiative
Portal References in Games
Blappeture Mesa
portal black mesa stats easter egg
[SFM] Gordon seeing a Vortigaunt in HL2
![[SFM] Gordon seeing a Vortigaunt in HL2](https://img.youtube.com/vi/me9dH-SF9L4/hqdefault.jpg)