How to Increase IQ
Brain Exercises

Benefits of Meditation
Mental Math

Riddles and Puzzles
Lateral Thinking

Difficult Riddles And Brain Teasers

Here are a few difficult riddles and tough brain teasers to exercise that brainpower. You'll find the solutions at the bottom of the page.

1. You can take away the whole and still have some left. You can take away some and still have the whole left. What is it?

2. If a man can walk 2 miles per hour, and needs nine hours of sleep each day, what is the fastest he could travel the 3000 miles from New York to Los Angeles?

3. The thunder comes before the lightning; the lightning comes before the clouds. The rain dries everything it touches.

4. "Duo" is the shortest word with "uo" in it. What is the longest word you can find with "uo" in it? There is at least one with 12 letters in it.

5. On a beautiful sunny day in Florida, a man freezes to death outside. How is this possible?

6. Can you punctuate the following, in order to make it a proper English sentence? I said that that that that that man wrote should have been underlined

7. Alex bought a bag of apples on Saturday, and he ate a third of them. On Sunday he ate half of the remaining apples. He ate one more on Monday and one more on Tuesday, then ate half of the remaining apples on Wednesday. On Thursday he looked in the bag and saw that there was just one apple left. How many apples did the bag have to begin with?


1. The word "wholesome."

2. Just about three hours in a plane. (Okay, or 100 days walking, but the riddle didn't specify that he was walking - just that he can walk two miles per hour.)

3. A volcano.

4. "Fluoridation" has 12 letters, and some dictionaries carry "fluoridization," with 14 letters, as a synonym. The word "duotrigintillion" is in some English dictionaries. It is the name for a very large number (10 to the 99th power), and it has 16 letters.

5. He climbed into the landing gear of a plane to get a free ride, and the temperature at 30,000 feet was 40 degrees below freezing.

6. I said that,"that 'that' that that man wrote should have been underlined. For a complete explanation, see the page; That Riddle About That "That".

7. 12.

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