What has keys but no locks, space but no room, and lets you enter but never go inside?

How to think about it

1. Keys with no locks suggests keys you press rather than keys you turn.
2. Space with no room points to a specific key, the long bar at the bottom.
3. Enter without going inside points to another key, the one that starts a new line.
4. All three clues describe a computer keyboard.

Why “a keyboard” is the answer

A keyboard has keys you press, a space bar that makes a blank instead of a room, and an Enter key that submits text instead of letting you walk in. Each clue is a key name read in its everyday sense. A piano also has keys but no space or enter, which is why the extra clues matter.

Common wrong answers

• A piano. A piano has keys without locks, but it has no space bar and no Enter.
• A house. A house has locks, rooms and a way inside, which is everything the riddle rules out.