May 6, 2006 Use it or lose it is the message for brainpower, so next time you see someone doing a crossword, just bear in mind that mental agility exercises of all forms are good for the brain and they’re exercising an important part of the brain. Now, the retailers of this crossword puzzle are claiming this to be the world’s largest crossword puzzle. We can’t verify that but we’ll suspend disbelief that the world’s largest can be just 2.1 metres by 2.1 metres (49 square feet) – yes, it’s still big, but, … shouldn’t the world’s biggest be bigger? It has 91,000 squares and 28,000 clues and even the clue book runs 104 pages. At AUD$59.95 (US$46), it’s probably the ideal present for a crossword nutter, or someone intent on staving off Alzheimers.