Officially there are currently two 9A boulders: Return of the Sleepwalker and Burden of Dreams. Both have not yet been repeated. Soudain Seul was demoted once and then upgraded again, currently checking in at 8c+/9a. Unofficially there are at least two other boulder problems that belonged at the top of the list of the most difficult boulders in the world, but Shawn Raboutou does not want to reveal them yet.
Seb Bouin recently opened the world's second 9c with DNA. On the occasion of this historical ascent, we have compiled a list of the most difficult climbing routes in the world from grade 9b for you. The compilation is continuously updated.