Extreme difficulty (maybe unsolvable?) killer sudoku : r/sudoku
Por um escritor misterioso
Descrição
New Killer Sudoku PR! 5:31, no mistakes, expert difficulty. : r/sudoku
Is this Killer Sudoku even solvable? : r/puzzles
Extreme Sudoku: 200 Extremely hard Sudoku by Proof, Puzzle
Killer Sudoku by Sudoku.com • Game Solver
World's hardest sudoku: can you crack it?
Naked Candidates
Killer Sudoku help! I can't get the online answer for this but have been dying to solve it but keep going wrong. If anyone is happy to help please let me know!
A Puzzling World – Treasure Trails
Killer Sudoku - Puzzle Games • Game Solver
Challenging Sudoku - eXtreme Sudoku : r/sudoku
Puzzles by Djape