Whoever made this map, clearly has no idea how map design works. You start with simple puzzles, before moving on to hard ones. Which nimrod put a parkour/timing puzzle as the second level in PART ZERO?!?! Have you ever played Half Life? Do you fight the Nihilanth during Anomalous Materials? Or even Portal itself? You don't fight GLaDOS in test chamber 1! What kind of loser puts stupid puzzles in the zero-th level? Clearly they're braindead or have Down's.