Unused Puzzle Types

While gathering puzzle types and their synonyms to add to indexed puzzles, I also encountered a number of puzzle types which are not represented in the index:

Crossword-type puzzles:

Other word puzzles:

Nikoli-style puzzles. There are a LOT of these. I've divided the list into three parts. First, there are these classic types, ones that have been around a long time, used in USPC, puzzle magazines, Grandmaster Puzzles, or other sources where a lot of people have seen them.

These are just the Sudoku variants:

And these are just all the other Nikoli-style types I know of which haven't been used in Hunt: