Fun Hard Brain Teasers with Answers

Our Top 10 best hard brain teasers and riddles. If you would like to add your own brainteaser you can do so at the bottom of the page.

10) Which is the odd number out?

a) 428
b) 236
c) 177
d) 800
e) 935

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9) Two police officers are examining a body that lies in the center of a sports field. With the body is an unopened package.
One police officer says to the other, "He must have been terrified knowing that the nearer he got to the center of the field, the more certain he was that he was going to die."
What was the package?

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8) The bedroom closet is pitch black but you don't want to wake your partner up. In the cupboard there are 20 pairs of blue slippers, 16 pairs of green slippers, and 24 pairs of red slippers. How many slippers will you have to take out (not knowing what color they are) before you get at least 2 of the same color?

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7) You are on a game show and you have an opportunity to win $1 000 000. You are shown 3 hats and under one of the hats is a check for $1 000 000. Each hat has 2 statements written on the top of it. You are told these facts: The statements on one hat are both true, the statements on another hat are both false, and the remaining hat has one statement that is true and one that is false.

These are the statements written on the hats.

Hat 1:
1. The $1 000 000 is not under here
2. The $1 000 000 is under hat 2

Hat 2:
1. The $1 000 000 is not under hat 1
2. The $1 000 000 is under hat 3

Hat 3.
1. The $1 000 000 is not here
2. The $1 000 000 is under hat 1.

You only have one shot at the prize. Under which hat is the $1 000 000?

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6) In the middle of the night a person lies awake in his hotel room. He desperately needs to sleep as he has an important business meeting the following day. At a certain point he picks up the phone, phones a number, doesn't say a word, disconnects, and then returns to sleep a few moments later. This happens again at certain stages throughout the night. Why?

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Well done! Now try the final 5 hard brain teasers.

5) What is the next letter in this sequence A, A, A, A, A ...

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4) Six glasses are in a row. The first three are full of juice; the second three are empty. By moving only one glass, can you arrange empty and full glasses alternate?

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3) There are 3 shoe boxes and each shoe box contains two balls. I shoe box has 2 white balls, another 2 black balls and the last 1 black and 1 white ball. On every shoe box lid is written the contents i.e. 2 black balls, 2 whites balls etc. But somebody changed all the lids around so that not one box has the correct lid. Question: How many balls would you have to extract and from how many different boxes to determine the correct sequence?

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2) Outside a room are 3 separate switches (A,B &C) that connect in some unknown order to 3 light bulbs inside the room. There are no windows and the door to the room is closed. Is it possible to determine which switch corresponds to which light by only visiting the room once?

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1) An undercover police officer needs to infiltrate an illegal gambling club but does not know the password required at the back entrance to the building. The day before he plants a microphone in the lamp just above the door so that he can listen to the conversations. That evening he listens while a man strolls up and knocks on the door.
The doorman says, "twelve" and the man replies, "six" and he is let in. A second man arrives. The doorman says "six" and the man replies, "three" and is let in. Certain he has heard enough the police officer walks up to the door. The doorman says "ten" so he replies, "five". A gun appears through a slot in the door and the police officer is told to take a hike.

Why, what should he have said?

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