The Sphinx's Challenge
What creature walks on four legs in the morning, two legs at noon, and three in the evening?
Human - as an infant, they crawl on all fours, as an adult, they walk on two legs, and as an elderly, they use a cane.
The Riddle of the Ages
I speak without a mouth and hear without ears. I have no body, but I come alive with the wind. What am I?
An Echo.
The Puzzle of Froge
It has keys but opens no locks. It has space, but no room. You can enter, but you can't go outside. What is it?
A Keyboard.