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
- ISBN10 0862784093
- ISBN13 9780862784096
- Publish Date 1 March 1995
- Publish Status Active
- Publish Country IE
- Imprint O'Brien Press Ltd
- Format Paperback (A-Format (178x111 mm))
- Pages 144
- Language English