Dave Evans, of Guest Book Puzzles, Weymouth said the jigsaw would be made up of 40, 000 pieces and reach 150 sq ft (13.9 sq m).

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"It's very complicated puzzles, " said Coney Island mom Radmila Gordon.

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Art history is often presented with various kinds of puzzles, including how to reconcile what an artist has said about a work when its visual evidence suggests the opposite.

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But "with the puzzles, he's getting frustrated, " she said.

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It will take Mr Evans, who said he had always been a "lover of puzzles", two weeks to cut the jigsaw at his workshop at Brewer's Quay in Weymouth.

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People assigned to do crossword puzzles showed typical cognitive one-year declines, Dr. Wolinsky said.

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In comparing computer-game use with another activity, he said he chose crosswords because many older people enjoy the puzzles and the general perception is that they keep the brain and mind active and engaged.

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His mother, who loved books so much that when she was asked to name 100 favorites she could only narrow the list to 165, was suddenly veering from being able to do crossword puzzles one moment to being unable to remember what she had just said.

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Mr Ware said he was disappointed that so many members spent so much time solving puzzles.

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The three Met crossword enthusiasts all said that wherever they go, they meet at least one or two players who also enjoy puzzles.

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