>>12812354this
>>12812354in most classes the extra credit is easy and just a way to get free points as this anon says
>>12812364but in my hardest upper div courses, some of the professors offered "extra credit" (grades were curved anyways) that were really hard problems that you solved only if you actually cared about the subject, and it is very good at giving a picture of who cares about the subject and isn't a retard.