I believe that the fifth puzzle, Tapa Like Loop, has four solutions and I don't see any reason why any of the solutions could be incorrect. While I was solving, I went with my gut and entered the solution that seemed most likely, and I got my points. But there are two places where the loops may or may not cross (first column, 5/6th row and last row, 7/8th column), and I don't believe the rules prohibit the crossing in any way.

I don't know whether the organizers already know about this, or if I made a mistake somewhere, but if the puzzle really has multiple solutions, it would be better to give a disclaimer or something.

We are aware of this. We added both the possible answer keys that come from it, and we aren't giving a disclaimer because it is the main competition and we want everyone to approach it with the same knowledge base.

The WPC policy on non-unique puzzles is consistently applied here.

I feel it's a bit of a lapse to not have included the general Night and Day rules in the puzzle booklet. It currently doesn't really state anywhere in the puzzle booklet that different loops can only cross when they visit the same cells.

We agree that it would have been helpful to include the beginning paragraph into the PB. Sorry for not thinking this through enough.

(Now that I've been identified as the author of this round: My apologies for the issue with puzzle five. (I hope those of you who encountered the error enjoyed the round in spite of this,)

Craig: I really enjoyed this round of puzzles - even though I had to restart a few of them several times until I could break out of old single-loop-puzzle habits. Really fun and unique to solve. Thanks!