Despite the apparent complexity I found it straight forward. It took a while to recognise the way through. Fiendish for elementary. Nice for kindergarten, went the wrong way first try. It's not that simple IMO. Spent ages getting 6, 4 and 2 off, finally got 41 after giving up (almost). I thought a nice kindergarten level with a couple of options to trip you up. (13 years ago) Very sweet !
Took me 12 tries. :)
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EDIT 2023, 22nd Jan. - very nice 2 offs.