"Knockin' on Heaven's Door (V11/12) is one of the purest and most uncompromising highballs I have ever done. I'm very happy I could get teh first ascent of this long-term project," said Tobias Haller on usa.moonclimbing.com. This highball in Zillertal, Austria, caught Haller's eye about two years ago. "Concerning the grading I'm not 100 percent sure," he says. "It's definitely hard V11. If I consider the work I put in it, V12 seems to be more appropriate."