Rules for Liar Loop
This genre idea developed when playing around with Maxi Loop puzzles and discovering how areas sometimes have very little options for the loop to run through and disallowing a certain value would also force the loop a certain way. This eventually led to the attempt to make puzzles with only disallowed values. And a new genre is born.
The puzzle is a bit tricky, but it's partly caused because the way of thinking is different than normal.