The Times Jumbo Crossword: Book 9Paperback, 1 January 2015

Compiled by the crossword editor of London's TheTimes, this original compilation will challenge even the most experienced crossword buff

With unique grids of 23 x 23 squares--larger than the standard 15 x 15 grid--these puzzles require serious word power and brain bending, and are the perfect quizzes for those looking to test their linguistic prowess to its limit. The clues are a little more testing than the daily Times2 crossword, to stretch the crossword enthusiast just a bit further, and provide hours of entertainment.