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https://www.puzzle-sudoku.com/
I've linked the sudoku page, but if you scroll down, there are dozens of other puzzles and they're all well-implemented and free with plenty of customization options, difficulty levels, leader boards, etc. I patreoned the dev recently. He's very responsive to any bugs, and considers, for example, a puzzle with multiple solutions to be a bug. He also adds new puzzles fairly regularly.
I'll raise you with https://www.gmpuzzles.com/blog/tag/gas/ - lots and lots of human made sudokus and other puzzles. The link is for GAS (genuinely approachable sudokus)
Also https://www.brainbashers.com/puzzles.asp#japan