Requiem: stuck in sprinkler room

[toyota582]

well, if you want there's an alternative to getting through there. Instead of going across thoes beams and doing that puzzle, you can jump down to the floor below and do a completly different puzzle, either way you end up at the same place.

so how do you do the puzzle down on the floor? I have already done this level the other way but would like to go back and try the alternate way.