u/Academic-Pass-2800

I used a CF platform where there were more then like 30 level (each had 4 problems)

first level had 4-800 rated problems then at next level it will have 3-800 rated and 1-900 rated

so it had progression like that , I used it and gave 2-3 contest's but right now i just completely forgot it's name , can't find it in my history either