Screenshots
Think with portals, not the gun
Lunch and a show
A similar chamber in Portal was far too easy
Your best friend
That blue field might be a problem
More valuable than the organs and combined incomes of everyone in [SUBJECT HOME TOWN HERE]
So I herd u liek boxes
The one chamber where gravity isn't your best friend
Take a closer look at the top-left
This isn't the solution, by the way
A series of tubes