Dear Ma'am, I have been using this website for about the last 6 months and I learnt so many new things.My seach for intellectual pursuit is bolstered by this site.The page featuring Brilliant-Squared says it will help me improve my mathematics levels.So honestly I'll say I'm comfortable with most of the level 4-5 problems on this site(The ones that I fail to solve I learn from the solutions posted by other users.)So if I upgrade to Brilliant squared would that be good for me??Or maybe should I go for a 1 month subscription just to go through the material?And also will any such feature be available for advanced users(level 5) in the near future??And also is there any other way that one can contribute/donate to Brilliant??