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Mensa Brain Teasers Puzzles and Riddles

Updated on April 11, 2016

Brain Workout

I just love puzzles, brain teasers, riddles and logic problems.

So much in fact that I have acquired a substantial amount of them.

I'm going to share some of my favourite ones with you here. Take your time and try to work each one out before you move on to the next one.

I have put the answers to the puzzles at the bottom of this article but no peeking until you have had a good go at working them out.

Trying to solve brain teasers is good exercise for your brain and is a good way to keep it healthy. In this article I'm also going to tell you some fascinating facts and give you tips on how to keep your brain in peak condition.

Interesting Number Plates

Taken from 101 Brain Teasers at Quiz Pub UK
Taken from 101 Brain Teasers at Quiz Pub UK | Source

Driving Through Europe

While driving down the Auto Estrada in Spain, Mr Jones sees two interesting number plates with strange configurations.

Mr Jones realises that the number plate from Spain has one letter that doesn't belong there and should be on the number plate from Portugal.

Can you tell which letter it is and why?

Brain Exercise

Did you know that doing puzzles and memory games can slow the decline of mental illnesses in old age or even prevent them from happening all together.

Doing regular brain exercises can prevent you from getting such terrible diseases as Alzheimer's disease and depression.

Children also benefit from brain games and will become more socialized and will do better when it comes to learning and doing well in exams.

Milk Is Good For You

Solve This Puzzle If You Can

You have six glasses in a line.

The first 3 glasses contain milk and the last three glasses are empty.

By moving only 1 glass can you arrange them so that they alternate from full glass to empty glass all the way along?

Expand Your Mind

Every time you learn something new your brain makes new connections or neural pathways.

Inactive brain cells die all the time so creating new ones is important and the way to do this is through learning and problem solving. Each time you learn something new you are actually strengthening your brain and increasing long term memory functions, thus making it easier to learn new things. Just like physical exercise, the more exercise you do the easier it gets over time.

Did you know that each time you sneeze some of your brain cells die?

If you don't use your brain you will lose it so solve this next puzzle and make some new neural pathways!

Can you arrange the letters from the following two words to make one word?


Parts Of The Brain

How Many Squares?

What number comes next in this sequence?

view quiz statistics

How often do you do a puzzle, brain teaser or quiz?

See results

This Quiz and Puzzle App will keep your brain active!

Do you like puzzles and trivia?

The above video shows an amazing new Android game that will keep your brain active and teach you new things all while having fun at the same time, best of all it's free to play. So if you're enjoying this article then you will definitely enjoy Game Show Adventure.

You can download the free game here: Android Game TV Show

Keeping Fit Also Keeps Your Brain Fit

Regular exercise actually has many benefits when it comes to brain health.

You will sleep better and suffer less from depression with a good exercise routine. In fact, regular exercise can prevent mental health problems from appearing in the first place. What exercising actually does is feed the brain with an insulin-type growth factor delivered through the blood supply.

Sleeping better is also a good factor towards a healthy body because when you are asleep that is when the brain regenerates and releases hormones for growth and development.

Which is the Odd One Out?

17 27 37 47

Our Brains Are Fascinating

You Are What You Eat

 Your brain is a hungry organ. It uses twenty percent of your oxygen supply even though it only weighs three pounds and makes up only three percent of your total body weight.

A healthy brain needs plenty of oxygen and the wrong foods can actually deprive your body of it. The type of foods that can deprive your body of oxygen are sugar based and high in saturated fat or trans fatty acids such as alchohol, hydrogenated vegetable oil and candy.

Avoid too many saturated fats such as those found in meats but be aware that your brain does need some fatty foods. Because your brain is made up of sixty percent fat it does need some to grow and regenerate so it would be unwise to cut out fat altogether.

Good brain food includes dark chocolate, dark vegetables, seafood and beans. It is also very important to eat plenty of antioxidant rich foods like yellow or orange fruit and vegetables.

Who Is The Smartest?

 You are in a room with 3 monkeys. One monkey has a banana, one has a calculator and one has nothing.

Which primate in the room is the smartest?

Map Of The Worlds Cleverest People

show route and directions
A markerHong Kong -
Hong Kong
get directions

This city has the highest IQ levels in the world when the average figure is worked out. The average IQ level for the people of Hong Kong is 107

B markerAustria -
get directions

Austria comes in 6th along with Germany with an average IQ level of 102

C markerNew Zealand -
New Zealand
get directions

New Zealand, UK, China and Belgium come in 12th place with an average IQ level of 100

D markerUnited States -
United States
get directions

The United States and Australia come in 22nd in the world with an average IQ level of 98

E markerPortugal -
get directions

Portugal comes in at 32nd in the world with an average IQ level of 95

And Now For The Answers!

I hope you enjoyed my brain teasers, puzzles and logic problems and now for the moment you've been waiting for, the answers!

The Number Plate puzzle

The letter is Z because it is made with straight lines and all the other letters on the Spanish number plate have curves in them.

Glasses Of Milk

You pick up the second glass and pour all the milk into the fifth glass and put the emptied glass back in the second position.

New door

The answer is at the end of the question. One Word

How Many Squares?

There are 11 squares

Odd One Out

27 is the odd one out because the others are all prime numbers

Who is the Smartest Primate?

You are!

Would you like another 101 Brain Teasers to have a go at? Go here: Quiz Puzzles


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    • The Quiz Master profile image

      Warren 2 years ago from England

      Hi Tracy

      I've had a look through my 101 brain teasers pack and I've found quite a few that you can turn into physical puzzles, if you combine some of the puzzles you can get either the 3 or 4 alpha or numeric answer that you are looking for. You can also use a lot of these puzzles in your events.

      You will have to download it from my website, click on the link underneath the interesting number plates at the top of this article to take a look.

    • profile image

      Tracy Townsend 2 years ago


      We are creating a Break Out Room in Australia and need some physical puzzles with either a 3 or 4 alpha or numeric answer. Are you able to email any that you know of please? Check out our webpage



    • The Quiz Master profile image

      Warren 4 years ago from England

      Thank you!

    • The Quiz Master profile image

      Warren 4 years ago from England


    • The Quiz Master profile image

      Warren 4 years ago from England


    • The Quiz Master profile image

      Warren 4 years ago from England

      Zaneria, stuip is as stuip does (Forest Gump).

      Yoloswag, glad you liked the article and spotting Zaneria's funny spelling mistake, Merry Christmas!

    • profile image

      yoloswag 4 years ago

      aewsome and even i didn't think it was S-T-U-P-I-D

    • The Quiz Master profile image

      Warren 4 years ago from England

      What's wrong Zaneria?

      Did you get them all wrong?

    • profile image

      zaneria 4 years ago

      this is stuip

    • The Quiz Master profile image

      Warren 4 years ago from England

      Thanks LTM and well done for getting them all.

      Thanks for the thumbs up too!

    • LongTimeMother profile image

      LongTimeMother 4 years ago from Australia

      Got them all, phew. Fun hub. Voted up. :)

    • profile image

      BTD6 maker 5 years ago

      Correct. It just happens to be 33,550,336.

    • The Quiz Master profile image

      Warren 5 years ago from England

      The numbers are perfect.

      A perfect number is a number whose total divisions equal itself.

      For example, 6 can be divided by 1,2 and 3 and 1+2+3=6

      28 can be divided by 1,2,4,7 and 14 and 1+2+4+7+14=28

      The next number in the sequence above must be huge!

    • profile image

      BTD6 maker 5 years ago


      Here's a hard one for you. What comes next in this sequence...

      6, 28, 496, 8128, ...

    • The Quiz Master profile image

      Warren 5 years ago from England

      Here's an easy one for you. What comes next in this sequence...

      324, 433, 542, .......

    • profile image

      Jake 5 years ago

      flip two switches, leave them on for awhile, switch one off. Its will either be on, off, or the bulb will be hot.

    • The Quiz Master profile image

      Warren 5 years ago from England

      I worked it out, but if I told you the answer then everyone reading this wouldn't have the pleasure of working it out themselves.

      Thanks for the riddle Eric.

    • profile image

      Eric 5 years ago

      This was too simple for Mensa riddles, really. Try this one:

      There are 3 electrical lamp bulbs in a closed room, they are wired/connected to 3 switches outside. The door is closed and there are no cracks or windows that you could see any light inside the room. When you arrive, all 3 switches are in off position. You may play any of the switches as long as you like and leave them in any position. When you are ready, you can open the door and go inside. Now, without switching again, you must tell what switch is wired to what lamp.

    • meow48 profile image

      meow48 5 years ago from usa

      this was too cool. take care. and thankyou. my iq of 128 really needs to start doing some of these because the old noggin ain't what she used to be. hee hee.

    • The Quiz Master profile image

      Warren 6 years ago from England

      Glad you enjoyed the brain test Nell and thanks for commenting.

      Good for you for re-writing your hub on black holes, I must admit it did drive me a little bit mad, still it's a very good hub.

    • Nell Rose profile image

      Nell Rose 6 years ago from England

      Hi, I realised something very embarrassing! 20 years ago, I passed the test to get into Mensa! my IQ was over 139, guess what? 20 years later my brain seems to have gone to sleep! ha ha very enjoyable, thanks oh and by the way, Mensa never mentioned Galaxy's! I have changed it now, thanks, I should have done it a while ago, my brother told me off about it, but then again he is the one that loves Astronomy! cheers nell

    • The Quiz Master profile image

      Warren 6 years ago from England

      Thanks Zoe, I'm glad you enjoyed it.

      I will be making more of these so keep an eye on me.

    • zoey24 profile image

      zoey24 6 years ago from South England

      I loved this hub. It was realy diferent from all the others i have read. I got the number of squares right and the 'one word' and 100% in the number sequence but failed the others lol. It reminded me of an IQ Test i did once. Voted up and awesome :)