Sudoku Mine - Hard

Play free Sudoku Mine Hard online or download printable Sudoku Mine Hard (up to 4 puzzles per page) to solve with pen and paper.

Pocket Sudoku: Medium to Hard Level - A Compact & Travel-Friendly Sudoku Puzzle Book, Only 4x6 Inches in Size!: Books, Patel Puzzle: 9781514381717: : Books

Live Sudoku - The Daily Sudoku

The personality of numbers as revealed in sudoku — Write Into Life

sudoku Archives - The Art of Puzzles

sudoku

Samurai Sudoku - Hard

Sudoku 3429 hard, Life and style

Cross+A :: Sudoku

Sudoku Solver in Python - Lior Sinai

Not hard puzzle, but how offten do you guys keep track of pentuples or higher, I noticed mine in box9 and just wonder on other people's approach(solved, just hope to get some

Sudoku 1,592 hard, Life and style

A Sudoku You'll Never Solve

New sudoku variant: Earthquake — Rätselportal — Logic Masters Deutschland