[Support request] Puzzle levels and your course levels

There are various “levels” of puzzles from easy to very difficult. I have access to the Freshman up to Senior lessons now. I’m curious which of your levels solve which degrees of difficulty. For example do the Freshman work for easy puzzles but not moderate or intermediate level? What level of puzzle can you solve after accomplishing all the Junior lessons? What level can you solve after the Senior lessons?

I’ve been away from Sudoku for a long time and haven’t visited this site since you only had up to Senior level and #410 didn’t exist then. I’d like to write a detailed review of your site on my blog which is why I’m asking so many questions. 🙂