Nave360's Charlie writes:
"'Overwhelming’ will be your first thought. ‘Exciting’ will be your second thought. ‘Confusion’ will be your third thought; they were my first three thoughts at least. Last year, I had actually dreamed of building my very own Portal map using the ‘Source’ engine, but since I know nothing of how to use the engine, creating a map just became too big of a dream for me. But then Valve came to me in a dream and said ‘Do not fear young one. For we have the solution for you’. And thus, the “Perpetual Testing Initiative” DLC was born. And thus, I realized it wasn’t a dream… well the part that “Valve” actually came to me in a dream was I suppose…"