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?
If eleven plus two equals one, what does nine plus five equal?
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’m orange, I wear a green hat and I sound like a parrot. What am I?
I’m tall when I’m young, and I’m short when I’m old. What am I?
What breaks yet never falls, and what falls yet never breaks?
I have a clock(12-hour format) and both the needles of the clock overlap at 12:00. After how much time, they will overlap again?
I don't get anymore wetter, no matter how much rain falls on me.
What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?
John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?
A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.
