I'd say climbing these walls was about a 7-8 in difficulty. I used to be a member of an indoor gym and spent a fair bit of time there but this was a whole new beast for me. The wierdest thing about this was how smooth the rock itself was, not like indoor gyms at all. If you couldnt get a definitive finger grab then you would just slide and fall so it got quite tough. Ya i got lucky I met them when I did though because the actual tour isnt quite so cheap, or so Ive been told.