DD allows you change the level of difficulty of each section in the song. Each section is represented by the square blocks at the top of the screen. If you have DD set to 20% on each section and get 100% of the notes right you have only mastered 20% of that song. If you bump up a section to 100% it will become purple. If all sections are 100%, you are playing the entire song. Songs with no DD are at 100% difficulty no matter what. Well ain't that a bummer. I had 4 songs at 100% that I thought I'd mastered. Bubble shattered :unsure: When I arrange my list by mastery it says 100%. I guess I should've moused-over the boxes below that. I've dl'd so many songs that I keep jumping around to try new ones and haven't paid much attention to anything else. Oh well, this gives me something fun to do this weekend. By god, I will master them for real now! :plus1: