Trick of Mind

I have a 5 letter word written in front of me. If you ask me any five letter word, I will tell you how many letters in common your word has with mine. If my word is BLACK and yours is WHITE, I will tell you 0. If my word is PLUME and yours is [...]

My small village post office, in the village of Diophantine, is selling 1st class stamps and 2nd class stamps in a book costing £3. If a 1st class stamp is 27p and a 2nd class stamp is 21p, how many ways can a £3 book be filled?

Your lovely new home has a window on the first floor which overlooks a beautiful lake. One day you come home to find the following note taped to the window, probably by your cat…
Dear Owner,
The window lets in too much light. Please tint it, though not all of it. Tint (on the inside) a solid [...]

Eketahuna is having a party. The party was to be held in his private mansion in the city of Puzzlaria. The city, conveniently, is laid out in a perfect grid. Every house’s address is composed of two positive numbers, indicating its relative position to the Town-hall in the southwest corner. For example, House 3-8 [...]

As is typical in your line of work, you find yourself trapped in a room with only one possibility of escape. On this occasion, Doctor No leaves you a puzzle to solve.
You wake up in a room with a single door, which you observe is the only way out of the room. On the door [...]

In deepest, darkest, Africa, a hunter stalks a monkey. He wants to shoot him with his tranquilizer gun and take him back to America for display at the zoo. The monkey, on the other hand, wants to stay in the jungle and swing in the trees.
This particular monkey is more cunning than most. He’s [...]