Is it possible to let users generate a pdf of their favourite problems sorted by topic, sub-topic and level? Something like "Add to my favourites" button next to each problem that would let each user compile a custom book of Brilliant Problems that he/she can print once a month or so.
Can you also add a search tool to search for past problems using keywords? As the no. of problems increases, it becomes increasingly difficult to trace a problem that you liked.
Also, is it possible to show us problems from levels above and below our home level, even if we are not allowed to solve them?
Thanks for the excellent problems and a great community around them.