Fantastic idea. There have been many puzzles where words jump from one place to the next, or go off the edge and "warp" back to the ...
read moreFantastic idea. There have been many puzzles where words jump from one place to the next, or go off the edge and "warp" back to the other side, but I don't think I've seen an actual underpass like this (which actually looks like an underpass!). Really neat idea. I find it mesmerizing to look at the grid — like watching traffic patterns unfold around a cloverleaf.
It was too bad there wasn't a symmetrical entry to UNDERPASS. That might have made this one of my all-time favorites. Yes, it would be difficult to incorporate an extra themer, but it's definitely doable (assuming you could find something that fits — maybe something to the effect of DOWN AND OUT?). For those of you who don't want the curtain pulled back, skip the next paragraph.

At first, it may seem like filling this grid is a magic trick, as you'd have to fill two disparate corners simultaneously through the breaks? But as with many eccentric constructions, it can be broken down into steps to make the process easier. After filling out the middle of the puzzle, you can put together a mini-grid (seen to the left) by squishing the two halves together (leaving the DELI of DELILAH and the ITOR of TRAITOR) and then filling normally. The results can then be transferred back to the original grid.
Finally, a note about three-letter words. Typically Will doesn't allow more than 22 of them except in special cases, because they break up a puzzle's solving flow and can be inelegant. From a construction standpoint, they can also cause problems. Check out all those threes running down the middle of the puzzle. Even though it looks like it should be easy to cleanly fill, it's not, because the number of acceptable three-letter words is limited. In fact, it would likely have been easier to fill this swath cleanly if it was four squares wide, because there are roughly 3x as many acceptable four-letter words than three-letter words!
A beautiful concept, strong enough that I didn't at all mind the blips here and there in the fill.