A Unique Shop for Old & Rare Books

Sudoku (pronounced as soo-dough-coo with the emphasis on the first syllable) is a simple number-base...

Su Doku (in Japanese Su = number; Doku = single) has been the most popular puzzle in Japan for the p...

This is the only ten-letter word that can be spelt just using the top row of letters of a keyboard? ...

The name of Patrick Moore is synonymous with night skies, constellations, Apollo Moon Shots, and BBC...

"How come he's got more marks than me when I'm more intelligent than him ?" It's a common sentiment ...

From the codes of Sherlock Holmes to secret Naval intelligence ciphers, here are hundreds of intrigu...

Can you make three triangles with four matches, work out the Damphampton holiday makers’ bri...

How about extending the definition of an 'expert, 'one who knows more and more about less and less'...

What does the Mona Lisa have in her left Hand?List the nine activities which are traditionally forbi...

At three I fell in love with numbers. It was sheer ecstasy for me to do sums and get the right answe...

Anyone can be a mathematician. Most people will not agree with me, I know. But I insist that any per...

To solve the world's most challenging puzzles, sometimes you have to be smart, sometimes patient, ...

The Human Computer explains and simplifiesEverything you always wanted to know about numbers but was...

This is what your child will find in this A to Z Quiz Series - brilliant books brimming with the lat...

Count on Kakuro for hours of fun What do you get when you combine the logic skills of sudoku wit...

The honorary president of world mensa tests the intelligence of all comers in the biggest collection...

How intelligent are you?Take the IQ Challenge to discover just how intelligent you really are!Featur...

Think your mental muscles are in a good shape? Here’s a true test of your reasoning strength ...

Intelligence quotient, as a useful means of measuring brain capacity, has come increasingly into the...