I think Sal and his team did it to relate more abstract concepts to people in a more lucid manner as (most) people relate to Harry Potter more than some symbols thrown at the screen. I do understan...

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3. Inappropriate Content/Use of Questions

i agree,I think there should be more of application based problems in Physics and Chemistry that could be given as "Missions".

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3. When will the Mission format used in Math be applied to other subjects?