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All newly published in book form, Simplex 150 has been compiled by Mary O' Brien, who has been setting the Simplex crossword for more than 20 years

The next book in the highly successful Simplex series.

Here are another 150 puzzles from Ireland's favourite crossword.

The first ever Bumper Book of Simplex Crosswords. Containing 300 Simplex crosswords, all newly-published in book form, the first ever Bumper Book of Simplex Crosswords has been compiled by Mary O'Brien.

Sudoku is a real cultural phenomenon: a French fad in the 1890s, a Japanese craze in the 1980s, it is peculiarly British obsession. This book contains 201 fiendish brainteasers, ranging from easy to mind-bogglingly difficult. It provides a daily fix for the hardened Sudoku fan and sets an addictive challenge for novices. It's more than a game.

Appearing daily in the Irish Times for over forty years, the Simplex crossword has attracted a devoted following.

The Simplex Crossword formula has been hugely successful and made bestsellers of all six books. Appearing daily in the Irish Times for over forty years, the crossword has attracted a devoted following.

Appearing daily in the Irish Times for over forty years, the Simplex crossword has attracted a devoted following.

The first two bestselling titles in the Simplex crosswords series combined in a great new edition.

A new title in the Fiendish Su Doku series, concentrating entirely on the more difficult Super Fiendish puzzles. These are previously unpublished quality Su Doku grids from the puzzle providers to The Times, and help to develop you to take on Extreme Su Doku.