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.
Simplex 4 contains:
60 Simplex crosswords
Space for recording time taken
Scribble space
60 solutions
Mary O'Brien has set Simplex crosswords for the Irish Times for over 20 years.
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