I think a lot of people in this thread have tried to solve puzzle 120 with a kangaroo. But since bitcoins are still in place, it means no one has solved it. Brainless somehow found a way to reduce the number of keys to search and if I understand the translation correctly, solved the puzzle 120, but did not withdraw funds. I could be wrong.
I am telling you, brainless' method is baloney. (I reverse engineered his script and I can share it right here if you want - it is useless).
Brainless did not manage to reduce a 120 bit key to a smaller range. He made 2^20
zones, each of which are 2^20th the size of the 2^256 range. (He said that himself, read his posts again carefully).