Travel Diabolical Sudoku

Check the sample puzzle on the back page to judge the difficulty!
Go beyond simple sudoku with this collection of diabolical sudoku puzzles in a travel-sized format of 8x5 inches.
1 large print puzzle per page for easy visibility and space for notes.
You will need strategies like X-Cycles, BUG, XY-Chain, X-Wing, Simple Coloring, Y-Wing, Swordfish & XYZ Wing amongst others to solve the most difficult puzzles possible.