(7 years ago) Got the correct general path early but was 2-off, then decided to change to the false one and worked on it (cries T__T). Finally go back to the correct one and find out the stupid mistake (cries again T__T).
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(12-9-2022) After so many years, I could only see the attractive false path first, having a 2 off again. Deciding that no further optimizations can be made, then saw the correct one. Several mistakes could get in the way as well. Really very nicely done, changed it back to 5 stars (had gave 4 stars in the past just because was too sad to be trapped by the beautiful false path).
My problem at that one is that I had 2 completely diff. ways to be 2 off, with not a clue what one can be cut.... I was working a long while on the wrong one :-(
5 tries :p But the only reason I got this so quickly was because I actually have a level in my unpublisheds that feature exactly the same sort of trick, but not so elegantly constructed. This is cleverly made, well done.
theres actually 2 or 3 small optimizations along the way that could have been implemented but weren't. even though the general path is the same, theres 3 variations on the solution.