Hard Riddles

Hard riddles with answers are a true test of your brain power, reasoning and comprehension. You are sure to find these tough difficult riddles both challenging and puzzling. While these hard riddles and answers may drive you a little crazy sometimes, they may surprise you in the way they force you think out of the box.

13 Caves and a Thief

There are 13 caves arranged in a circle. There is a thief hiding in one of the caves. Each day the thief can move to any one of the caves that is adjacent to the cave in which he was staying the previous day. And each day, two cops search any two caves of their choice for the thief. So, one cave is searched per cop per day.

13 caves and a thief

The following conditions apply.

  1. The thief may either move to an adjacent cave or stay in the same cave.
  2. The cops can check any two caves each day, they do not need to be adjacent.
  3. The thief only moves to the adjacent cave when the cops are making their rounds.
  4. If the thief moves from cave X to adjacent cave Y and if one of the cops is going to check on either cave X or cave Y, the thief will be caught.

What is the minimum number of days to guarantee in which the cops can catch the thief?

Riddle Answer

Tomorrow I Will Lie

James and Jonathan are liars, who lie on specific days. James lies on Fridays, Saturdays and Sundays, but he is honest on all other days. Jonathan lies on Tuesdays, Wednesdays and Thursdays, but he tells the truth on all other days.

On what day of the week would they both say “Tomorrow, I will lie.”?

Riddle Answer

Black and Blue Marbles

A king decided to let a prisoner try to escape the prison with his life. The king placed 2 marbles in a jar that was glued to a table. One of the marbles was supposed to be black and one was supposed to be blue.

If the prisoner picked the blue marble, he would escape the prison with his life. If he picked the black marble, he would be executed. However, the king was very mean and he wickedly placed 2 black marbles in the jars without any blue marbles. The prisoner witnessed the king only putting 2 black marbles in the jars.

The jars were not see-through, the jars were glued to the table and the prisoner was mute so he could not say anything. How did he escape with his life?

Riddle Answer