I'm a bit confused... The prompts are optional and one can make a game that doesn't fit any of them, correct? I know it says "optional" both in the title and the post itself, but the phrasing makes it sound like you have to pick at least one prompt.
Can you elaborate on where it seems to imply that one must be picked? The wording seems clear to me, but I'm happy to update the placeholder post to make it less ambiguous if I know where that ambiguity lies.