My frustration with this level was that even if you try to do the alternate route correctly to avoid the guard and follow the clues it's still not really workable because one of the steps you have to accomplish to access the alternate route seems to be based on the random luck of the physics engine happening to do something differently than it usually does, so you have to try again and again until finally the luck breaks your way on ... uh... the thing you have to do that it would be a spoiler to mention what it is. I spent about half an hour trying again and again and again until finally the physics engine reacted ... uh..... differently than it usually does. I can't reallay say more without a spoiler, but people who've done the alternate route probably know what I mean.