Kids Riddles

Question: What starts with an e but only has a single letter in it?

Question: I can be cracked, I can be made. I can be told, I can be played.

What am I?

Question: I have a tongue but cannot taste.
I have a soul but cannot feel.

What am I?

Question: You have found a mutant algae that doubles in size every hour. It takes 18 hours for one algae plant to take up half of a certain lake.

How long would it take for two of these plants to take up half of the same lake?

Question: Enter one hole and leave three,
once you succeed I'm on thee?

What am I?