Kropki

You can get really far into this puzzle without relying on the negative constraint, perhaps just long enough to forget it’s there.

It may seem like a lot of constraints, but it's a Samurai Sudoku, so you should only have deal with one or two at a time.

I hope you’re not tired of Region Sum Lines yet. I hope the blue lines aren’t driving you… around the bend!

Perhaps someone’s a little tipsy, but they’re watching over you as you solve this puzzle.

White Kropki dots are simple, and there are only a couple of them. XV clues are more interesting, and there are a lot of those. Still not enough to make it clear how to solve the puzzle, but that’s because of the global constraint. This puzzle demonstrates an overt bias against knights: no knight’s moves allowed!