Funster Hard to Extreme Sudoku 400+ Puzzles: with printed candidate numbers

Carefully designed for EXPERT Sudoku solvers.Includes printed candidate numbers. Writing in candidate numbers for each unknown square is an important step when solving advanced Sudoku puzzles. This tedious task is already completed so the solving analysis can begin immediately using the process of elimination.All puzzles can be solved using advanced logical techniques. Unlike some Sudoku puzzles, no trial-and-error (or guessing) required.Lots of puzzles with three levels: 134 Hard, 134 Very Hard, 134 Extreme.BIG GRIDS with room to work (and high-quality paper).Wide inner margins make it easy to tear out for convenience.Includes free bonus puzzles you can download.