Scratch My Head
Tear one off and scratch my head,
What once was red is black instead.
What is it?
The Riddler (Edward Nigma) is a fictional supervillain and an enemy of Batman. He is created by Bill Finger and Dick Sprang.
Tear one off and scratch my head,
What once was red is black instead.
What is it?
How many numbers between 1 and 100 can you pick at most, so that none of them divide another?
I am big on Saturday and Sunday.
I am small on Tuesday, Wednesday, and Thursday.
I am not on Monday and Friday.
What am I?
White to play and mate Black in 20 moves.
One night, a man received a call from the Police. The Police told the man that his wife was murdered, and that he should get to the crime scene as soon as possible. The man immediately hung up the phone and drove his car for 20 minutes. As soon as he got to the crime scene, the Police arrested him, and he got convicted for murder.
How did the Police know that the man committed the crime?
What does the liar do when he dies?
Find all 10-digit numbers with the following property:
There are 5 points in a square 1×1. Show that 2 of the points are within distance 0.75.
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