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How Are the Portal and Half-life Games Connected?
Half-Life & Portal - The Complete Story (What You Need to Know!)
The Combined Timeline | COMPLETE Half-Life & Portal Story & Lore
The Portal Half Life Connection (Where Do They Tie In?)
GLaDOS Half Life Reference "Things have changed since the last time..."
The Valve Universe Theory
Every Valve Game Explained in 11 Minutes
Over 3 Hours of Half-Life & Portal Lore
Portal vs Half-Life
The Portal Iceberg: Explained
All Half Life references in Portal
The "Every Valve Game Is Connected" theory-MVGT9K
