Change the minimum number of coins to grade from 250 to at least 500

user made GTG challenges.
user can create challenge by entering great collections items IDs and then upload them for other people to try.

I think it would be great if all the imperfections (with only coins that possess them, of course) were visually illuminated through some sort of algorithm/system with annotations of the exact imperfections each coin possesses, along with the degree of the imperfection (maybe it could even be interactive on a level). This would enhance user learning by instilling a semi-objective benchmark. This mode could be an optional extension and a great supplement to the educational mode. (I am sure more insights could be added to this blueprint.)

I think it would be really cool if we can extract our results into a dataset that we can download as a CSV or something. I would love to run data analytics and draw conclusions about the type of series I need to work on the most. I'm thinking some columns like date, mintmark, type, actual grade (with prefix and suffix included), guessed grade, and some other helpful metrics would be great. It would be even better if this dataset could be updated in real time after every guess and we can download it again any time.

This might be hard to do and it's really a miniscule thing but maybe after you grade a coin it pulls up an image of the full slab so you can notice the subtle differences in grading standards between the different slab types.
Maybe it could pull up in the top right corner of this screen: