Just One Line
Add just one line to create a correct equality.
SOLUTION
Add a line to the plus to transform it into a four.
Category: Puzzles
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Simple Sum
Which number must be written in the place of the dots?
Remark: The missing number does not necessarily have 3 digits.
SOLUTION
If you turn the paper around, the text will read:
… = 19969 + 68199
99106 = 18108 + 80998
Therefore, the missing number is 88168, which after 180 degrees rotation becomes 89188.
Tight Spot
White starts and mates in 2 moves.
SOLUTION
White plays Rh6. If Black moves the bishop, Rxh7 is a mate. If Black takes the rook, g7 is a mate.
FEATURED
Prisoners and Hats
100 prisoners are given the following challenge: They will be taken to a room and will be arranged in a column, such that each of them faces the backs of the prisoners in front. After that, black and red hats will be placed on their heads, and the prisoners will be asked one at a time what is the color of their hat, starting from the one at the back of the column. If a prisoner guesses his color correctly, he is spared; if not – he is executed. If every prisoner can see only the hats of the prisoners in front of him in the line, what strategy should they come up with, so that their losses are minimized?
SOLUTION
There is a strategy which ensures that 99 prisoners are spared and there is 50% chance that one of them is executed. Clearly, one can not do better.
The strategy is as follows: The first prisoner (at the back of the line) counts the number of black hats worn by the prisoners in front. If the number is odd, he says “BLACK”. If the number is even, he says “RED”. Then, the second prisoner counts the black hats in front of him, figures out the color of his own hat, and answers the question.The third prisoner sees the number of black hats in front of him and uses this information, along with what the second prisoner’s hat is, to determine the color of his own hat. The prisoners continue in the same manner until all 99 prisoners in the front guess their hat colors correctly. The chance for survival of the first prisoner is 50%.
John and His Lawyer
John is talking to his lawyer in jail. Both of them are very upset
SOLUTION
John was visiting his lawyer who was the one in jail.
FEATURED
Manifold
Manifold is a brilliant puzzle invented by Jerome Morin-Drouin. Based on the origami principle, the goal of Manifold is to fold the printed paper several times, so that eventually you will end up with a 4 × 4 square which is white on one side and black on the other. The Manifolds here are provided by The Incredible Company and are part of their Manifold game which contains a total of 100 puzzles. Click the images, download them, print them, and solve the puzzles.
Source:
Puzzle Giveaway 2
Our second giveaway is over. Congratulations to the winner, M M Del Rosario, and to his nephew, who will have countless hours playing with all the wonderful toys we chose for him from Fun.com!
For our July giveaway, we are partnering with our friends at Fun.com, a great website for games, toys, and fun Halloween costumes. We have prepared for you a colorful picture with lots of hidden stars in it. Answer correctly what their number is and on the 15th of July, you could be the lucky winner who gets more than $100 worth of puzzles and games, including “Perplexus”, “Codenames”, “Manifold”, and many more!
Flow Maze
Enter the maze, pass through all yellow circles, then leave the maze. Go only the flow, not shard turns.
SOLUTION
The solution is shown below.
The Last Move
What was the last move made in this game?
SOLUTION
The last move was white king takes black knight on c1.
One to Eight
Prepare a piece of paper with dimensions 2×4, then fold it four times to form 8 squares. Write on the squares in the top row the numbers 1, 8, 7, 4, and write on the squares in the bottom row the numbers 2, 3, 6, 5.
Now your task is to fold the piece of paper several times, so that the squares end up on top of each other, with the numbers appearing in ascending order top to bottom, and 1 face up.
Once you do this, try again with numbers 1, 8, 2, 7 on the top row, and 4, 5, 3, 6 on the bottom row.
SOLUTION
Coming soon.