Buy "Guardian" Sudoku by The Guardian from Australia's Online Independent Bookstore, BooksDirect.
The Guardian Sudoku 2: A collection of more than 200 tricky puzzles
The Guardian Quick Crosswords 2: A compilation of more than 200 enjoyable puzzles
The Guardian Quick Crosswords 1: A collection of more than 200 entertaining puzzles
The Guardian Cryptic Crosswords 2: A compendium of more than 100 difficult puzzles
The Guardian Killer Sudoku 1: A collection of more than 200 challenging puzzles
The Guardian Cryptic Crosswords 3: A collection of more than 100 satisfying puzzles
The Guardian All-New Sudoku 1: A collection of more than 200 fiendish puzzles
The Guardian Killer Sudoku 2: A collection of more than 200 formidable puzzles
The Guardian Cryptic Crosswords 1: A collection of more than 100 perplexing puzzles
The Guardian Quick Crosswords 3: A collection of more than 200 engaging puzzles
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