Solutions are on the youtube page of this video.
http://www.youtube.com/watch?v=xIVejv9sHLg
I’ve come across one of the best dungeons I’ve expereienced in a while. A dungeon where it relies on your thinking to solve and where you need to read the lore behind the world to understand. I loved the riddle puzzles as I actually read the lore behind each of the characters and found it a nice break to solve puzzles without having to kill a bunch of monsters.
The bridge itself is another example of a thought puzzle in the game, after figuring out that I needed a combo of two characters to keep the bridge up, a third to move around and open up a new path, and my fourth to walk across, I was amazed. Finally, a thinking puzzle. I took out some pen and paper and began recording which stones I needed to stand on in order to make a path across, testing each stone with a character moving all around. After about 10 minutes, I got my solution and was on my way to the Sacred Urn of Andraste.
