For those who did not see my other post, at the risk of being annoying (but I think it's more important to respect the wishes of the setter of this fine puzzle), Elap pleaded:
TO WHOM IT MAY CONCERN
If anyone divulges the secret, they will be stripped naked, hung upside-down, and beaten on the soles of their feet with a dead carp.
YOU HAVE BEEN WARNED...
I am sure the "secret" involves what you have to do after you fill the grid, so I think we are good so far. Can we respect his wishes and not give away the secret, please, for once? If you are stuck, you can email me but Elap clearly does not want the secret posted.