Riddle: You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer, and a five-minute timer, how can you boil the egg for only two minutes?
Answer: Once the water is boiling, turn the three-minute timer and five-minute timer over. When the three-minute timer runs out, put the egg in the boiling water. When the five-minute timer runs out, two minutes have elapsed and it is time to take the egg out of the water. You don't need the four-minute timer for this riddle.
Riddle: What goes on four legs in the morning, two legs in the afternoon, and three legs in the evening.
Answer: Man, who crawls as a baby, walks on two legs as an adult, and uses a walking stick in his twilight years.
Riddle: It is a 5 letter word if you take away first letter it is something you get from sun, if you remove second letter you will get something to eat, if you remove third letter you get a word you use in pointing at and if you remove the fourth letter you get something to drink. What is it?
Answer: Wheat.
Difficult Riddles
Riddle: Tomorrow Is Neither Wednesday Nor Thursday. Yesterday Was Not Friday Or Saturday. Today Is Not Thursday Nor Monday Nor Sunday. What Day Is Today?
Answer: Friday.
Riddle: How much will a 38° angle measure when looked at under a microscope that magnifies ten times?
Answer: It will still be 38°.
Difficult Riddles
Riddle: When asked how old she was, Suzie replied, "In two years I will be twice as old as I was five years ago." How old is she?
Answer: She's 12!
Riddle: Lighter than what I am made of, More of me is hidden Than is seen. What am I?
Answer: An iceberg.
Difficult Riddles
Riddle: I am a three digit number. My tens digit is five more than my ones digit. My hundreds digit is eight less than my tens digit. What number am I?
Answer: Number 194.
Riddle: What was never scared but became petrified, can't make a bird but can make a bat, can't live in a house but would die to have one. What is it?
Answer: A tree.
Riddle: How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. Iam twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put togeather. How old is the man's son?
Answer: Five.
Riddle: Name an eight-letter word that has kst in the middle, in the beginning, and at the end. What is it?
Answer: Inkstand - kst is in the middle. "In" is the beginning, and "and" ends the word.
Riddle: I have three feet but can't walk; I tell you things but can't talk; Sometimes I bend but I'm mostly straight. I'm like a scale but can't tell your weight. What am I?
Answer: A yardstick.
Riddle: I'm found in the sea and on land but I can't walk or swim. I travel by foot but I'm toeless. No matter where I go I'm never far from home. What am I?
Answer: A snail.
Riddle: If 4+2=26, 8+1=79 and 6+5=111. Then, what is 7+3?
Answer: 410. 4+2=26 is because 4-2=2 and 4+2=6,so it is 26. Therefore, 7-3=4 and 7+3=10(410).
Riddle: Different lights do make me strange, thus into different sizes, I will change. What am I?
Answer: I am the pupil of an eye.
Riddle: It has five wheels, though often think four, You cannot use it without that one more, You can put things in it, you can strap things on top, You can't find it in the market, but you can still go shopping. What is it?
Answer: A car.
Riddle: Find the four digit number in which the first digit is one fourth of the last digit, the second digit is 6 times the first digit, and the third digit is the second digit plus 3. What is it?
Answer: 1694.
Riddle: What is the next number in the sequence? 2, 3, 5, 9, 17, _
Answer: 33. The pattern:  Double the previous number and subtract 1.
Riddle: My thunder comes before the lightning; My lightning comes before the clouds; My rain dries all the land it touches. What am I?
Answer: A volcano.
Riddle: A man was found dead in his study. He was slumped over his desk and a gun was in his hand. There was a cassette recorder on his desk. When the police entered the room and pressed the play button on the tape recorder they heard: "I can't go on. I have nothing to live for." Then there was the sound of a gunshot. How did the detective immediately know that the man had been murdered and it wasn't a suicide?
Answer: The cassette had started at the beginning of the man's utterance. Someone else had to be there to rewind the tape.