1,000 + Sudoku Classic 8x8: Logic puzzles medium - hard levels

1,000 + Calcudoku sudoku 6x6: Logic puzzles medium - hard levels (Sudoku CalcuDoku)

Jigsaw Sudoku Challenge: 1000 Expert-Level Puzzles for the Ultimate Solving Experience - Test Your Limits with 1000 Challenging Jigsaw Sudoku Puzzles - Yahoo Shopping

sudoku-puzzle brain games by Atlantic Mediation Services LLC

medium sudoku book –

1,000 + sudoku jigsaw 8x8: Logic puzzles hard levels Basford Holmes 9781700184924

medium sudoku book –

Puzzle Maker Pro - Sudoku Large Squares 1

Kakuro Challenge, Level 2 Not Really Easy: Number Puzzles, 8x8 - 10x10 (Brain Game Puzzles) - Yahoo Shopping

1,000 + sudoku jigsaw 8x8: Logic puzzles medium - hard levels (Paperback)