What has keys but can't open locks, space but no room, and you can enter but not go outside?

Category: Knowledge · Difficulty: hard

Hint: Think about something used for typing.

Answer

A piano keyboard

Explanation

A keyboard has keys for typing, a space bar, and you can 'enter' commands.

This is a hard knowledge riddle — a tricky one that takes a little thought. The answer is A piano keyboard.

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