I needed many tries, here. Didn't find it easy or obvious, at all. I'm very happy to have finally found 178.
Like many, this one seems so easy and logical, too, but to me only AFTER solving. :)))
This is a BEAUTIFUL level, I love it! Looks simple, but it's not, heheheh. Easy to come 4 or 2 off, but hard to cut that off, for me.
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EDIT 2023, 28th Feb. - after 6 years I still find it an excellent level! So many combinations, but only one 258, as far as I could find.