(4.) Unique Sets

I noticed I forgot to specify a rule yesterday: the rule that numbers may not repeat within a region. I did correct it soon enough after posting the puzzle, though.

A version without a no-repeats rule could well be interesting as well: then, there’s a choice on how to interpret regions with repeated numbers.

  • The choice faithful to the name would be to ignore repeated numbers: for example. a region with {1, 1, blank} would have the same set as a region with just {1}.The example puzzle on the rules page actually solves under these rules as well (as does yesterday’s puzzle, unsurprisingly).
  • The other choice would be to consider them distinct: that is, the regions would be multisets. This would probably be the less interesting variant, but it could work well in sparser puzzles.

Anyways, today’s puzzle operates under the no-repeats rule.

004 Unique Sets 2

Standard Unique Sets rules.


(3.) Unique Sets

To my knowledge, this is an original puzzle type (but do tell me if someone’s already invented and named it).

This puzzle should serve as an easy starter, but I quite like the example puzzle on the rules page as well.

003 Unique Sets

Regular Unique Sets rules.