One of my favourite levels on the site, so so so cool First tried, though I really like the subtleties of the solution! Was stuck on 2-off for quite a while. Fun to work out, fun to optimise, good stuff :D Probably my favourite out of your recent levels, deducing the right path is difficult but fair. Very thoughtful elementary. Very clever structure, and the logic behind which path works (at least for the 243) is very cool!