Discovered via simulated annealing with 'backwards solving'
In this case, given the hole/wall setup on the bottom 2 rows, and the blocks, the anneale...
This immediatelly reminded me of one of Reachs' levels (iiirc, it was Reach's), but I couldn't remember the solution (or the name, or anything else), so it was like a new solve for me (also that level had more blocks, iirc, but in the upper right corner it had about the same structure). :) I was searching for it (after I solved this), but couldn't find it.