A vary very very difficult puzzle by Phoenixdrachen on DeviantArt
Some Of The Most Difficult Puzzles You Can Get Online
Sudoku Puzzles: Easy to VERY difficult two puzzles per pages: with solution - Easy, medium and hard puzzle book with large print for a a book by Sudokuss Publishing
Amazon.com: Yuu Asaka Jigsaw Puzzle 16 - Level 8 - Very Difficult : Toys & Games
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CHRISTMAS SUDOKU Puzzle Book for Adults: 100+ Large Print Puzzles - Easy, Medium, Hard and Very Difficult (Puzzle Books Plus): Andrews, Kat, Plus, Puzzle Books: 9781732752023: Amazon.com: Books
Trinity Metal Puzzle - Very Difficult Puzzle – Kubiya Games
Very Difficult Number Search and Word Search: Puzzles for Brainiacs: Zebra, Puzzled: 9781977836366: Amazon.com: Books
Hypnosis, Mr. Gogo, around 500 pieces. Hand-cut wooden puzzle. A difficult image and a difficult cut—very challenging for the size! : r/Jigsawpuzzles