A bit confused to start with, but once I see the blocks needed, the solution came shortly. Demoted this from Grandmaster to Professor. Fun classic level.
Very interesting ! I found two 2 offs, in 23 tries. Will keep trying ! Edit1: three 2 offs, in 45 tries. Edit: found a few more 2 offs, then finally got it, in 64th try. GREAT level !
