Big Head Zach
When Rolling 4 dice to complete a task, would using a clue token allow you to:
a) re-roll all dice OR one die
b) re-roll all dice OR any number of dice
A clue token lets you take any or all of the dice you just rolled, and re-roll them, before determining whether or not you complete a task.
Also, for clarification: There doesn't appear to be anything in the rules stopping you from using a second clue token if the first one didn't produce the desired results. Is this correct?
Correct. If you have a number of them you can keep spending them until you get the result you need, or you run out and fail at completing a task.