Dice Game

 

 

Guess the number

 

Ask a friend to pick a number from 1 through 1000. After asking him 10 questions that can be answered yes or no, you tell them the number. What kind of questions should you ask your friend so that you find their number? 

Source: Kordemsky, The Moscow Puzzles

Full part of the glass

 source: Presh Talwalkar

Plant Puzzle

 

from SKG

Some solutions

Bad Logic

 

 

Two Rational Numbers

 

Source:@blatherwick_sam

Three of the many possible solutions:

In the Shoe

 

 

What time is it?

 

Twelve Dots

 

 

Source:@JustinAion

Google Drive

Rugby Fixture Puzzle

 

Source: Rob Eastaway, New Scientist

 

A Path Puzzle

 

Source: The Tokyo Puzzles

 

Stars Puzzle

 

At least how many stars should you move so that each row and each column has three stars?

source: Emrehan Halıcı

3

Measuring Oil

 

Source: The Tokyo Puzzles

 

Twenty Socks in a Drawer

 

 

A girl had twenty socks in a drawer. There were ten red socks and ten green ones. One night, just as she was going to take out a pair of socks, the lights went out. If she wants to get a pair of the same color, red or green, what is the smallest number of socks she must take out of the drawer? Assume that the socks are all mixed up.

Soseki's Books

On the shelf stand volumes 1, 2, and 3 of the first edition of Soseki's I Am a Cat. The books have been lying there for a long time, and moths have dug a tunnel from page one of volume 1 to the last page of volume 3. The paper in each volume is 3 centimeters thick and its cover is 1 centimeter (front and back covers are 5 millimeters each). Can you tell how long the tunnel is?

 

 

 

 

Source: The Tokyo Puzzles

Counterfeit Coin

 

Source: The Tokyo Puzzles

The Broken Window

 

 

 

Several children were playing in my backyard. Sud denly I heard the noise of a window breaking. I dashed out and saw four children looking at pieces of broken glass in my garage. Surely one of the children must have broken the garage window. 

"John broke the window," said Ann. 

"No, Gail did it," said John, grinning. 

Gail's sister Sally declared, "It wasn't me!" 

Gail said, "Me? John is a liar to say I did it." 

Of the four children only one spoke the truth. 

Who is the culprit? 

 

 

Source: The Tokyo Puzzles

BLOXO Cubes

source

 

The Tropical Fish

 

(This is a puzzle from The Tokyo Puzzles written by Kobon Fujimura and edited by Martin Gardner)

The Dog Puzzle

This dog, made of matches, is here shown facing west. Make him face east by changing the positions of just two matches. It is easily done by moving three matches, but can you do it by moving only two?

(This is a puzzle from The Tokyo Puzzles written by Kobon Fujimura and edited by Martin Gardner)