You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?
Can you solve this picture maths equation?
The more of this there is, the less you see. What is it?
How many letters are in the alphabet?
I have four wings but can't fly. I express no emotions. I am found on the exact spot every time you look. I keep toiling away with a little sound. Do you know what am I?
What is the riddle which can be asked all day with a different correct answer each time.
How can you write nineteen in a manner that if we take out one, it becomes twenty?
Give it food and it will live; give it water and it will die.
A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log. Can you calculate the weight of the entire wooden log?
I get hot but I never sweat, I cook food but I am not a chef, I have a door but you can't enter me, I have a light but I am not a lamp. Who am I?
In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki
