I am six off, and can't find any shorter, atm. It's GM for a reason. Will keep trying and hope to find 278. :)
EDIT (12 hours later): I've now found those 6 steps. Very nice.
I feel a bit ashamed at that one: I had the solution since ages, but just forgot to try changing the order... When I finally did that, I won... About 20 tries wasted... LOL
Beat this a few months ago but just realized I didn't leave a review. Any of these sections would already be tricky on its own, but putting them all in a row like this makes for an evil level. It's hard to know where to look to save the last few steps, I had to look over each section many times before finding all the ideas.
My ranking of the sections from hardest to easiest: 5, 3, 2, 4, 1
Insights