The minimal interface necessary to answer our critical questions:

• Might people play a game like this?
  • What might pique their interest? (Acquisition/Recruitment)
  • What might maintain their focus? (Engagement/Retention, short-term)
  • What might draw them back? (Engagement/Retention, long-term)
• Can we use a game like this to collect valuable (generalizable) data?
  • How much data (from how diverse a set) can yield results out-of-domain?