(Disclaimer: I only tried the boulder sections.)
Klimhal Amsterdam is the /only/ boulder gym in Amsterdam that does not use a simple straightforward color coding for their boulder routes. The system they use instead is extremely confusing, and makes it very hard to figure out what the grades are, or even what holds are part of the routes. It got so annoying that after half an hour of frustration and very little climbing, I just left. Really a shame, seemed like a promising place. I have no idea why they choose to use such an absurd system, but I'm going to stick to the other boulder gyms in Amsterdam. read more