XXI #6: the long way was 8

Nobody has logged a solve on this one yet.

Reveal the long way (8 tiles)

862211718736917245626559

Numbers on green tiles show the order. Other 8-tile routes may exist — this is the one the solver finds first.

Every XXI grid has a three-tile answer and a much longer one. The score is how many tiles you used, so the question is never whether you can make 21 — it's whether you found the long way. How to find it.