Su Doku Library Books

Introduction

Su Doku Library Books should be used in conjunction with the Pappocom Sudoku software, which is available for purchase from http://www.sudoku.com.

Grading

The puzzles, all of which are solvable by logic alone, are graded according to the toughest pattern to appear.

• Easy - A single candidate exists for each move.
• Medium - A Single Sector Candidates pattern is involved.
• Hard - A Disjoint Subsets pattern is involved.
• X-Wings - An X-Wings pattern is involved.
• Swordfish - A Swordfish pattern is involved.
• Nishio - A Nishio pattern is involved.

The Pappocom software will label Swordfish and Nishio puzzles 'Arguably Unfair'. I would agree that Nishio puzzles are arguably unfair - however, it seems a trifle harsh to apply this label to Swordfish puzzles.

Available library books

The following books are available for download:

• puzzle3x2_10.sudbook, which contains ten 10-cell puzzles on a 3x2 grid.
• puzzle3x3_24.sudbook, which contains ten 24-cell puzzles on a 3x3 grid.
• puzzle3x4_42.sudbook, which contains five 42-cell puzzles on a 3x4 grid.

Microsoft does its bit to make the download procedure more complicated than it might be:

• Right-click on the link and select 'Save Target As'.
• Change the directory name in the file dialogue box to the Pappocom library directory, typically C:\Program Files\Pappocom\Sudoku\Library.
• Change the file extension from .xml to .sudbook.