skip to main content


Random Puzzles 


?

Puzzle 1 


Starting with the 6 in the bottom left corner, what is the highest total you can make, if you only move up or right, using the mathematical signs on the way?

Note: this puzzle is not interactive, and the numbers cannot be clicked.

Puzzle Copyright © Kevin Stone

workings hint answer print

?

Puzzle 2 


Starting with COLD, change one letter at a time until you have the word WARM.

Each change leaves the other letters in their original places and must result in a common word.

What is the minimum number of steps required to achieve this change?

workings hint answer print

?

Puzzle 3 


In the illustration we have a sketch of Sir Edwyn de Tudor going to rescue his love, who was held captive by a neighbouring wicked baron.

Sir Edwyn calculated that if he rode at fifteen miles an hour he would arrive at the castle an hour too soon, while if he rode at ten miles an hour he would get there just an hour too late.

Now, it was of the first importance that he should arrive at the exact time appointed, in order that the rescue that he had planned should be a success, and the time of the tryst was five o'clock, when the captive would be taking afternoon tea.

The puzzle is to discover exactly how far Sir Edwyn de Tudor had to ride.

Sir Edwyn De Tudor, Amusements In Mathematics, Henry Ernest Dudeney.

workings hint answer print

?

Puzzle 4 


You have a barrel, filled to the top with water, which weighs 150 pounds.

What can you add to the barrel in order to make it lighter?

workings hint answer print