Design a Playset or Game for a Specific Age and Situation

Most lists of children's activities assume you have materials, space, and the children are already interested. This designs three options for your specific situation and age range: one that requires nothing at all, one that uses only what you already have, and one that needs five minutes of setup but runs longer. Each comes with what to do when interest starts to fade, because it will.

I need to entertain {CHILD_AGE_RANGE} for {TIME_DURATION} in {SITUATION} [for example: a long car journey, a rainy afternoon at home, waiting at a restaurant, a flight].

Available resources: {AVAILABLE_RESOURCES}

Design [three] distinct options:
- Option 1: a game or activity that requires no materials at all
- Option 2: a game or activity using only what is already in the situation (phone, paper and pen, items in a bag)
- Option 3: a game or activity that requires [five minutes] of preparation but then runs for longer

For each option give: what it is, the core mechanic or rules in [three sentences], why it works for this age range and situation, and what to do when interest starts to fade.