Simple Cross Number is constructed on a crossword grid just like a standard crossword, but the digits 1 to 9 are used instead of the letters of the alphabet. In

Test your powers of logic and mental agility with this mixed collection of 500 number and logic puzzles from the MindGames section of the Times. Puzzles include

Are you sharp enough to solve these devious mind-bogglers? These diverting number, geometric, logic, analytical, and story problems--which vary in difficulty fr

Here is a puzzle book that will have even the masters begging for mercy--and for more. Almost Impossible Number Puzzles has more than 275 puzzles offering a var

Collection of number puzzles. There are logic problems, mathematical puzzles, matrix problems, series puzzles, and many more besides.