You probably could've guessed that the groundbreaking concepts and gameplay Portal has created over the years wasn't done overnight. It took a whole lot of work, trial and error, and several revamps that Valve News Network uncovers in this behind the scenes look. You'll see Portal in Beta when it was more Half Life 2 than anything, hear about different story ideas, and see several different versions of GLADOS.

Anything you see that you wish would've made the final cut, or was it all for the better?