Horace Walpole (1717-1797) sent the following riddle to Lady Ossory, claiming that it was composed by physicist and mathematician Isaac Newton: Four people sat down at a table to play; They play’d all that night, and some part of next day; This one thing observ’d, that when all were seated, Nobody play’d with them, and […]

In the September 29, 1888, edition of Weekly Wisconsin, the following strange enigma appeared, composed by an anonymous writer named “Maude”: Perhaps the solvers are inclined to hiss, Curling their nose up at a con* like this. Like some much abler posers I would try A rare, uncommon puzzle to supply. A curious acrostic here […]

Using the digits 1, 2, 3, 4 twice, form an eight-digit number in such a way that there is one digit between the 1’s, two digits between the 2’s, three digits between the 3’s and four digits between the 4’s.

Here is a very simple match puzzle. Move just a single match to form a perfect square. This is indeed an easy puzzle. However, there are two ways to solve this and the solution depends on who’s solving the puzzle.

What is the smallest rectangle which can be made by using jigsaw pieces of these two shapes only? What is the next smallest such rectangle? What rectangles are possible using these shapes only? (Note: You can use no matter how many of these two jigsaw pieces as you see fit.)

Lay out six matches in the way depicted in the illustration. The objective is to shift one match without displacing the others so that the resulting arrangement would represent an arithmetical fraction equal to 1. You are not allowed to move the match forming the horizontal fraction bar.

Here are the clues to a Word Chain: A → tail end of cat → headgear → deer → vital organ → fireside. The solution is, A → AT → HAT → HART → HEART → HEARTH. Each link in the chain is formed by adding one letter to the previous link, without changing the order of its […]

Image: Wikimedia This story originates from India. A man died and left seventeen elephants to his three sons. His will said, “My eldest son gets half of my elephants, my middle son gets one-third, and my youngest son one-ninth of the seventeen elephants.” However, there is no way you can divide seventeen elephants that way […]