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### Top 10 Hard Level Puzzles

Top 10 Hard Level Puzzles

Hard Level Puzzles 1 : Popular Age Problem
Difficulty ★★★★☆     Popularity ★★★★★

Two old friends, Jack and Bill, meet after a long time.

Three kids
Jack: Hey, how are you man?
Bill: Not bad, got married and I have three kids now.
Jack: That's awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool¦ But I still don't know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh now I get it.

How old are Bill's kids?

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Hard Level Puzzles 2 : Brain Twister Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

2+3=8,
3+7=27,
4+5=32,
5+8=60,
6+7=72,
7+8=??

Solve it?

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Hard Level Puzzles 3 : Pyramid Number Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

The below is a number puzzle. It should be read left to right, top to bottom.
1
1 1
2 1
1 2 1 1
1 1 1 2 2 1
? ? ? ? ? ?
? ? ? ? ? ? ? ?
Question 1: What is the next two rows of numbers?

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Hard Level Puzzles 4 : Cipher Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

What does this message say?

G T Y O R J O T E O U I A B G T

Hint
Count the letters and try splitting the letters up into groups.

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Hard Level Puzzles 5 : Cross Bridge Puzzle
Difficulty ★★★★☆     Popularity ★★★★☆

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

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Hard Level Puzzles 6 : Weighing Balance Puzzle
Difficulty ★★★★☆     Popularity ★★★★☆

You can place weights on both side of weighing balance and you need to measure all weights between 1 and 1000. For example if you have weights 1 and 3,now you can measure 1,3 and 4 like earlier case, and also you can measure 2,by placing 3 on one side and 1 on the side which contain the substance to be weighed. So question again is how many minimum weights and of what denominations you need to measure all weights from 1kg to 1000kg.

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Hard Level Puzzles 7 : Hard Maths Puzzle
Difficulty ★★★★☆     Popularity ★★★★☆

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

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Hard Level Puzzles 8 : Monday Cipher Puzzle
Difficulty ★★★★☆     Popularity ★★★☆☆

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

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Hard Level Puzzles 9 : Missing Piece Puzzle
Difficulty ★★★★☆     Popularity ★★★☆☆

Below the four parts have been reorganized. The four partitions are exactly the same in both arrangements. Why is there a hole?

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Hard Level Puzzles 10 : Wise Cipher Riddle
Difficulty ★★★★☆     Popularity ★★★☆☆

Decipher
yyyy u r, yyyyy u b, i c u r y+y 4 ? by sharks. How would you survive?

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Last Updated:2011-10-07