Because regular crosswords aren't nerdy enough
Sure, a website with some form fields is a bit of a loose fit for this video game blog. But Regex Crossword is an interactive experience that entertained me for most of the weekend ... and it compares favorably to Copy Editor.
Following a co-worker tip to this harrowing puzzle, I saw the same link posted to /r/programming and followed that trail to the Regex Crossword site. Of course I did that standalone puzzle, too; but the Regex Crossword site is much more noteworthy.
The puzzles with bi-directional hints could get pretty annoying, and I swear that some puzzles could have had multiple solutions (more than one character fitting the row and column hints). Especially in the Hamlet section, I got the feeling that quotation-based solutions weren't deterministically verified quite as thoroughly.
But those quibbles aside, Regex Crossword gave me a damned impressive amount of the very kind of logic puzzles I'm hungry for.
I didn't even get to the user-submitted puzzles, for fear of how deep that rabbit hole might go.
Better than: Copy Editor, Prime Mover, Puppy Cross
Not as good as: Human Resource Machine, Murder by Numbers
And it's hard to argue with: free!
Progress: Finished all the built-in puzzles.