Counting to 9A Sudoku Variant¹ Pack

What is this pack?

This is a series of otherwise unrelated² puzzles which each have the digits 1 to 9 on a diagonal.

Often when I am setting puzzles, I will start with some pattern like this (whether in the givens or variant clues) in order to facilitate the creative process. Staring at a blank grid can be daunting - once I have some things in the grid, I can really start to experiment with how they work together and what additional logic I can bring out with new clues.

Also I like patterns and symmetry. All of the puzzles in this pack were designed with symmetry³ in mind.

The difficulty of these varies quite a bit. Expect a few to be GAS-level or close to it. At least one has a key Thing that is hard to spot but breaks the puzzle open nicely, and it would fit in well with the Classic Sudokult pack if it were a classic puzzle. One is a classic⁴, even though this is allegedly a variant pack. They are (very) roughly ordered by difficulty, and the last⁵ two puzzles are quite challenging indeed, but all are logically⁶ solvable.

I considered adding some sort of meta-puzzle element to this, but I wasn’t totally satisfied with my ideas for that, and anyway: the puzzles themselves are the reward. Enjoy⁷!