Bottleneck

Roskoe

Looking carefully gave me the rough idea how to solve it, but some optimisation also necessary to get it right.

(13 years a go) Sweet puzzle !
Took me 8 tries.
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EDIT 2023, 28th Jan. - such a cool path. I think it deserves 5 stars.

Still teaches good lesson on pipelining despite it was made 14 years ago.

a month ago I had 4 off.
finally saw neemo's path :)
good level.

The one off wasn't my natural one to try out. Would've missed the "teaching moment" if I hadn't explicitly read the description.