Thanks for the comments ;). Note: A new, and better, version is available in my world: "[PP1] No Particular Way To Go". Those who have already beaten the PP2 version and don't remember the solution should try it; the main trick is much harder to see ;).
Since I'm better at level making than I was at the time I made the PP2 version, I decided to switch it back to PP1 ;). It will be easy for those who already know the solution, but harder than the PP2 for those that don't. Which version do you prefer?
Insights