I think I understand what is your problem. Go on top of the second tower (where you got a "mirror"). There is a "key". I think there is a "key" in the first tower as well. Then search the chests everywhere so you can find other "key"s.
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Clicking on the pictures will send you to my profile page where are the links to all this awesome stuff.
I won't start playing it yet (I'm going to play it all with my two friends) but I checked it out and I saw some of the branches and I have to say this is a thousand times better than Diversity 1, both aesthetically (great improvement) and in the gameplay senses.
All the "deaths" in trivia are amazing, in general, really good job dude, keep it up.
So think we found a few problems (played on multiplayer, hosted on my home PC (2-6G RAM allocated; around 30mbps dl, 3mbps up) with 2 other players; using minecraft 1.8):
Puzzle branch's 'Toggle Pillars' doesn't appear to do anything(?), also I'm not sure if we missed something in the puzzle, but that first light puzzle didn't seem to have a solution (my friend eventually tried using an auto-solver for that type of puzzle, each time stating it seemed unsolvable) - could've been something we missed, but either way it was moderately annoying to 'solve', we may just suck as those things, though.
Also, after solving the jukebox-pipes puzzle, we were all stuck in a red room, a pressure plate behind us had barriers in front, and the iron door in front of us was locked -seemed like a bug to me, as there was nothing in there (we we had to TP ourselves out)
The /give for bows in the portal-style puzzle did not work numerous times, it clears instantly as it gives (seems like a trigger-order mistake, I recommend not trying to abuse redstone trigger-order in general), it also never gave us an arrow to fire the bows; my buddy managed to fix the first few, having to use blockdata since you block us from using gm, but it happened repeatedly, which was pretty frustrating...
We were able to escape to the trees in the Adventure branch, by jumping up onto the trees (I cannot remember the exact spot, if you really can't find if I may try going back into the map to find it again)
I'd leave a review but I don't think you'd want to read it (not trying to imply anything bad about the map, but my opinions are rather strong, and the people I played with are even bigger pessimists than me)
OMG! The adventure branch was... OMG! It took me around an hour to complete it.
Spoilers ahead (obviously):
The first part was the thinking part. I found only 7 of the 8 "mirrors" (I searched everywhere, but I did not find th last one ) so I had to cheat . Other than that I did ok there. But the second part... I did not die but it was so intense the whole time! The dark house made it almost like a horror map (I get scared easily).
You should have checked those creepy paintings a bit more