Soluzione #2 per Il Mistero del Muro

The special feature is LED bulbs, built into each hold and programmed by a special app that you can use to load your sequence of holds! And you use the app to turn on the lights of the holds in your route.

Here are the instructions taped to the wall of the gym next to the tilting walls:

And here’s a description of the special app:

You can use the app to program the lights at any gym you go to that has the system, or even send the route as a challenge to your girlfriend in Japan!