Wei-Hwa Huang wrote:
»Some difficulty is that sometimes it's hard to distinguish between a Sudoku variant and a puzzle that simply uses a Latin square concept. So, I've restricted myself to cases where the puzzle seems clearly inspired by "Number Place" or "Sudoku".«
http://www.mathpuzzle.com/Sudoku/WeiHwaSudoku.htm
Then follows a collection of puzzles which Wei-Hwa Huang considers to be a Sudoku variant (with one exception, of course).
Sudoku Notes from Wei-Hwa Huang
Re: Sudoku Notes from Wei-Hwa Huang
This is a fascinating link, thank you for sharing!