If you downloaded the puzzle "Registered Nurse" on April 27, it was unfortunately not solvable without guessing. You can now replay the April 27 Weekly puzzle, which is now the reissued "River greetings".
I'm sorry for the oversight. To prevent this from happening again, I've implemented an extra layer of solvability checks on all submitted puzzles.
As an apology, please tap the button below to claim 10 free Bolts:
Thank you - Joel