In 2004 a British newspaper added a new puzzle feature, setting off the modern Sudoku craze. In 2008, a rival British newspaper introduced NumberCrunch, setting

-- Mega-Bytes provide hours of interactive puzzles, quizzes and games that let kids have fun while they are learning. -- By clicking on elements on the computer

More stimulating mathematics puzzles from bestselling author Paul Nahin How do technicians repair broken communications cables at the bottom of the ocean withou

'Lucid and entertaining. With barely an equation in sight, Numbercrunch makes a passionate case for how just a little bit more numeracy could help us all' - Tom