Including riddles in a game is really simple when you know how. For the Dryad’s Riddle, I would use a code like this:
*temp Answer
Who's the black private dick, that's a sex machine to all the chicks?
*input_text Answer
*if ("$!!{Answer}" = "SHAFT")
*goto Correct
*else
*goto Incorrect
*label Correct
You're damn right!
*label Incorrect
He's a complicated man, but no one understands him but his woman.