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Baldyville - Back to the Cool Math Games These are the conditions in Baldyville: 1. No two inhabitants have the same number of hairs on their head. 2. No inhabitant has exactly 518 hairs. 3. There are more inhabitants in town than hairs on any individual inhabitant's head. What is the highest possible number of inhabitants? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Unfaithful Wives - Back to the Cool Math Games An anthropologist studying a primitive tribe in a remote location in the Amazon basin, had uncovered a strange tribal custom. Whereby, if a husband found out his wife was unfaithful to him, he must execute her in a public ceremony in front of the whole tribe on the same day at midnight. It so happened that every man in the tribe knew about every cheating wife except his own, since telling a man about his cheating wife was against the tribal honor code. On the day of his departure, the anthropologist held a tribal meeting and made the announcement: “I know there are unfaithful wives in this tribe.” On the ninth day thereafter all cheating wives were executed at the same time. How many unfaithful wives were there? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Why 1 = 2 - Back to the Cool Math Games Find the mistake in these mathematical equations. x = 2 x(x-1) = 2(x-1) x2-x = 2x-2 x2-2x = x-2 x(x-2) = x-2 x = 1 This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Open polygon - Back to the Cool Math Games Connect all 9 dots with 4 straight lines without lifting the pencil off the paper, and without going over the same line twice. This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Pears - Back to the Logic Puzzles There are a few trees in a garden. On one of them, a pear tree, there are pears (quite logical). But after a strong wind blew, there were neither pears on the tree nor on the ground. How come? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Apples - Back to the Logic Puzzles A basket contains 5 apples. Do you know how to divide them among 5 kids so that each one has an apple and one apple stays in the basket? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Sack - Back to the Logic Puzzles A poor farmer went to the market to sell some peas and lentils. However, as he had only one sack and didn't want to mix peas and lentils, he poured in the peas first, tied the sack in the middle, and then filled the top portion of the sack with the lentils. At the market a rich innkeeper happened by with his own sack. He wanted to buy the peas, but he did not want the lentils. Pouring the seed anywhere else but the sacks is considered soiling. Trading sacks is not allowed. The farmer can’t cut a hole in his sack. How would you transfer the peas to the innkeeper’s sack, which he wants to keep, without soiling the produce? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Sea Tales - Back to the Logic Puzzles The captain of a ship was telling this interesting story: "We traveled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Ship Ladder - Back to the Logic Puzzles A ladder hangs over the side of a ship anchored in a port. The bottom rung touches the water. The distance between rungs is 20 cm and the length of the ladder is 180 cm. The tide is rising at the rate of 15 cm each hour. When will the water reach the seventh rung from the top? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Hotel Bill - Back to the Logic Puzzles Three people check into a hotel. They pay $30 to the manager and go to their room. The manager finds out that the room rate is $25 and gives the bellboy $5 to return to the guests. On the way to the room the bellboy reasons that $5 would be difficult to split among three people so he pockets $2 and gives $1 to each person. Now each person paid $10 and got back $1. So they paid $9 each, totaling $27. The bellboy has another $2, adding up to $29. Where is the remaining dollar? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Small Hotel - Back to the Logic Puzzles 13 people came into a hotel with 12 rooms and each guest wanted his own room. The bellboy solved this problem. He asked the thirteenth guest to wait a little with the first guest in room number 1. So in the first room there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the twelfth guest to room number 11. Then he returned to room number 1 and took the thirteenth guest to room number 12, still vacant. How can everybody have his own room? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Puzzling Prattle (by Sam Loyd) - Back to the Logic Puzzles Two children, who were all tangled up in their reckoning of the days of the week, paused on their way to school to straighten matters out. "When the day after tomorrow is yesterday," said Priscilla, then 'today' will be as far from Sunday as that day was which was 'today' when the day before yesterday was tomorrow!" On which day of the week did this puzzling prattle occur? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Twins - Back to the Logic Puzzles Two girls are born to the same mother, on the same day, at the same time (Edit: of course, not both at once - one right after the other - you know what I mean ), in the same month and year and yet they're not twins. How can this be? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Photograph - Back to the Logic Puzzles I am looking at somebody's photo. Who is it I am looking at, if I don't have any brothers or sisters and the father of the man in the photo is the son of my father? Or as the classic riddle goes: Brothers and sisters, I have none but this man's father is my father's son. This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

One-Way Street - Back to the Logic Puzzles A girl who was just learning to drive went down a one-way street in the wrong direction, but didn't break the law. How come? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Cost of War - Back to the Logic Puzzles Here's a variation on a famous puzzle by Lewis Carroll, who wrote Alice's Adventures in Wonderland. A group of 100 soldiers suffered the following injuries in a battle: 70 soldiers lost an eye, 75 lost an ear, 85 lost a leg, and 80 lost an arm. What is the minimum number of soldiers who must have lost all 4? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Bavarian - Back to the Logic Puzzles One glass has 10 cl of tonic water and another 10 cl of fernet. Pour 3 cl of tonic into the glass with fernet and after mixing thoroughly, pour 3 cl of the mixture back into the glass with tonic water. Is there more tonic in the glass of fernet or more fernet in the glass of tonic? (Ignore the chemical composition!) This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Just in Time - Back to the Logic Puzzles What occurs once in every minute, twice in every moment, yet never in a thousand years? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

The Short Ones - Back to the Logic Puzzles • Why can't a man living in the USA be buried in Canada? • Is it legal for a man in California to marry his widow's sister? Why? • A man builds a house rectangular in shape. All sides have southern exposure. A big bear walks by, what color is the bear? Why? (similar to the Bear riddle in the section Einstein's Riddles) • If there are 3 apples and you take away 2, how many do you have? • How far can a dog run into the woods? • One big hockey fan claimed to be able to say the score before any game. How did he do it? • You can start a fire if you have alcohol, petrol, kerosene, paper, candle, coke, a full matchbox and a piece of cotton wool. What is the first thing you light? • Why do Chinese men eat more rice than Japanese men? (Edit: Why do Chinese men eat more rice than Japanese men do?) • What word describes a woman who does not have all her fingers on one hand? This old topic is locked since it was answered many times. You can check solution in the Spoiler below. Pls visit New Puzzles section to see always fresh brain teasers.

Have you come across a beautiful illusion on the web? Share it here: 1. create account in these BrainDen forums 2. start new topic in this Illusions subforum 3. attach your illusion picture in your topic Have you seen our whole collection of optical illusions yet?

Have you heard/seen some wonderful puzzle that you really liked? Or maybe don't even know the answer? You can post it right here - just start a new topic for each new puzzle.

If you are stuck on some level of logic games published on my Brain Games page, you can paste a small screenprint here and there might be someone who could help you.

Don't you know what to look for in the illusions published on my page (eg. Visual Illusions or Optical Illusions)? Attach here the one you would like know the trick for and I will give you a hint.

First of all, solution for almost every puzzle published on my site (non-forum pages) is accessible via page http://brainden.com/solutions.htm. Link to that page is placed on all pages - check the top right hand corner for 'solutions'. If you are interested in some particular puzzle and the provided solution is not clear to you, you can start a new topic.

My 3 google gadgets I made for you are as follows: Brain Teasers gadget Puzzles & Riddles gadget Famous Optical Illusions gadget I have written the Brain Teasers and Illusions gadgets in several languages. In particular, English, German, French, Spanish, Italian, Russian, Japanese and simplified Chinese. So if you have a google account and you have already added my gadgets (mentioned above) to your google home page, then you can see them in several languages (depending on what your country and language preferences are). For instance, after you have added my gadgets, you can see them in Spanish via this link - http://www.google.com/ig?hl=es. For more language abbreviations check http://www.google.com/apis/gadgets/i18n.html. If you are a native speaker (of the 8 above mentioned languages), you can check them and find some bugs. Have fun.