I quite like it when I look and play through a level and think to myself "this is really easy, what's the problem?" and get owned at the end. There are a few subtler cuts in here that took a few more tries to see, and one of them in particular is very nice.
Real good one! At first I needed some work to find out a plausible route, once so far, I was 6 off, and because there was one location I hadn't used so far, I decided to do so and it gave me the winning route. Big big fun.
Not that hard if you really think about it. I would elaborate, but I don't want to spoil the level's cute solution and the fun that comes with figuring it out.