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Special puzzles may be found as subpages here.
- /Cracking The Cryptic (Video channel for the work of Mark Goodliffe and Simon Anthony).
- /Inkala's Maze. Once upon a time, the world's most difficult sudoku. Still a challenge.
- /AI Escargot. Another puzzle from Arto Inkala.
- /Vidar's Monster#3 from 2006
- /Sudoku Dragon Hard puzzles.
- /Morl User on forum.enjoysudoku.com.
- /Unsolvables from SW Wiki
- /Andrew from https://andrews-sudoku.blogspot.com/
- /Extreme examples of Extreme puzzles cracked with Simultaneous Bivalue Nishio.