I have just made this video containing 10 bets that you will almost win (kinda). About 1 min in I present one of my favourite puzzles – the vanishing square.

You can download your own version of the puzzle here.

So, the puzzle is….why does a square seem to vanish?

If you have not tried to solve it, have a go now. For everyone else the answer is after the break.

The following video explains the puzzle, albeit with a slightly different set of shapes. Basically, the top shape is not an exact triangle, and so when the pieces are rearranged, the area that makes up the ‘missing’ square are redistributed in a different way. Did you solve it?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called **PUZZLED** and is available for the **Kindle **(UK here and USA here) and on the **iBookstore** (UK here in the USA here). You can try 101 of the puzzles for free here.

A very different type of puzzle this week. I have just made this video containing 10 bets that you will almost win (kinda). About 1 min in I present one of my favourite puzzles – the vanishing square.

You can download your own version of the puzzle here.

So, the puzzle is….why does a square seem to vanish?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called **PUZZLED** and is available for the **Kindle **(UK here and USA here) and on the **iBookstore** (UK here in the USA here). You can try 101 of the puzzles for free here.

On Friday I set this puzzle…

Imagine the Earth is perfectly circular and has a circumference of 24,000 miles. If you had a piece of rope stretched around it, touching the floor, that rope would also be 24,000 miles long. If you were to add 3 feet to that rope and then make it hover above the ground until it’s a perfect circle again, approximately how far off the ground would it get?

If you have not tried to solve it, have a go now. For everyone else the answer is after the break….

The rope would raise 6 inches off the ground if you added 3 feet to it! Can anyone explain why and what is surprising about this answer?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called **PUZZLED** and is available for the **Kindle **(UK here and USA here) and on the **iBookstore** (UK here in the USA here). You can try 101 of the puzzles for free here.

Here is a lovely puzzle sent to me by Ashley F. Solution on Monday.

Imagine the Earth is perfectly circular and has a circumference of 24,000 miles. If you had a piece of rope stretched around it, touching the floor, that rope would also be 24,000 miles long. If you were to add 3 feet to that rope and then make it hover above the ground until it’s a perfect circle again, approximately how far off the ground would it get?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called **PUZZLED** and is available for the **Kindle **(UK here and USA here) and on the **iBookstore** (UK here in the USA here). You can try 101 of the puzzles for free here.

On Friday I posted this puzzle…..

What do the following words have in common?

DEFT

FIRST

CALMNESS

CANOPY

LAUGHING

STUPID

HIJACK

If you have not tried to solve it, have a go now. For everyone else the answer is after the break.

Each of the words has 3 consecutive letters from the alphabet! Did you solve it?

**PUZZLED** and is available for the **Kindle **(UK here and USA here) and on the **iBookstore** (UK here in the USA here). You can try 101 of the puzzles for free here.

Solution on Monday.

What do the following words have in common?

DEFT

FIRST

CALMNESS

CANOPY

LAUGHING

STUPID

HIJACK

**PUZZLED** and is available for the **Kindle **(UK here and USA here) and on the **iBookstore** (UK here in the USA here). You can try 101 of the puzzles for free here.

]]>

]]>

On Friday I set this puzzle….

Imagine a test with 26 questions. When you get a question wrong you are deducted 5 points. When you get a question right you are given 8 points. If you answered all of the questions, and had a final score of 0 points, how many questions did you answer correctly?

If you have not tried to solve it, have a go now. For everyone else the answer is after the break.

You answered 10 correctly – but can anyone explain why?

**PUZZLED** and is available for the **Kindle **(UK here and USA here) and on the **iBookstore** (UK here in the USA here). You can try 101 of the puzzles for free here.

Solution on Monday.

Imagine a test with 26 questions. When you get a question wrong you are deducted 5 points. When you get a question right you are given 8 points. If you answered all of the questions, and had a final score of 0 points, how many questions did you answer correctly?

**PUZZLED** and is available for the **Kindle **(UK here and USA here) and on the **iBookstore** (UK here in the USA here). You can try 101 of the puzzles for free here.