Conundrum‏

• 
  

What is a riddle 

whose answer is a pun *

or involves an unexpected twist?

[*: That's it, plays with words.]

A logical postulation 

that evades resolution;

an intrincate and difficult problem.

A question or problem

having only a conjectural answer.

A puzzling question 

in which the person

trying to solve the problem

may need to ask questions

to gain the information 

needed to solve it.

A riddle in which 

a fanciful question

is answered by a pun.

A paradoxical, insoluble, 

or difficult problem; a dilemma.

A riddle wrapped 

in a mystery,

inside an enigma,

that perhaps has a key.