I am a box that holds keys without locks. I can be opened but never empty. What am I?
Category: Brain · Difficulty: hard
Hint: Think about something that creates music.
Answer
A piano or keyboard
Explanation
A piano has keys that are not locks, and while it can be played or opened, it produces sound and music, thus never truly being empty.
This is a hard brain riddle — a tricky one that takes a little thought. The answer is A piano or keyboard.
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