Critical Thinking Puzzles

A man wanted to get into his work building, but he had forgotten his code. However, he did remember five clues. These are what those clues w...

You have two sand hourglasses, one that measures exactly 4 minutes and one that measures exactly 7 minutes. You need to measure out exactly ...

Write a meaningful sentence of 15 words in such a way that the first word is of one letter long, second word of two letters, third word is t...

4 prisoners are caught and are to be punished. The Judge allows them to be freed if they can solve a puzzle. If they do not, they will be hu...

There are 100 doors in a row numbered from 1 to 100. Initially all are closed. Then you make 100 passes by the 100 doors. In pass 1 you togg...

What is unusual about this paragraph? You will find that this is not just an ordinary paragraph if you look at its words. An odd group of wo...

Golo is locked in a cave. He is having 2 vessels with him (5ltr & 7ltr). The gate of the cave will open only when there are exactly 6 li...