What Has 88 Keys, But Can’t Even Open A Single Door?

Riddle: What has 88 keys but can’t even open a single door?

Answer: A piano.

Why this answer works

The riddle is a wordplay on the term keys. A full-size piano has 88 keys used to play notes, not to open locks—so it can’t unlock any doors.

Fun fact

Most acoustic pianos include 52 white keys and 36 black keys, adding up to 88. That’s why the number in this riddle is so iconic.

Popular variations

• What has keys but can’t open locks? → A keyboard (or a piano)
• What has many keys but no doors? → A piano
• What has keys that make sounds? → A piano

Related riddles

• What gets wetter the more it dries? → A towel
• What can fill a room but takes up no space? → Light
• What has hands but can’t clap? → A clock

FAQ

Why is a piano the answer?
Because the riddle uses the double meaning of the word “keys.” Piano keys make music, not open doors.

Can the answer be “keyboard”?
Yes. Some versions accept “keyboard,” since it has keys that produce sound but don’t unlock anything.

How many keys does a piano have?
A standard full-size piano has 88 keys — 52 white and 36 black.