In Beatmania IIDX there are two separate difficulty category for songs: the difficulty rating and difficulty type. Rating goes from 1 to 12, Color is Normal, Hyper, and Another.
Every song has a Normal, Hyper, and Another, and each of these have different ratings assigned to each Color, like 4 Normal, 6 Hyper, and 9 Another. But you also can have, for example, 6 Normal, 8 Hyper, and 11 Another.
Most players measure themselves with the number system than they do with the type. "I can play level 9 songs for now." It decides their skill level. I have been slowly getting up more and more and currently I comfortably sit at playing level 10 songs, and I'm slowly trying to break into level 11.
It's a little funny how different it is at level 10. It's the gateway skill level to enter the harder segments of Beatmania. And one thing I noticed is that level 10 Hyper charts are much more difficult than level 10 Another charts these days, which is different when you go back to level 9, because level 9 Hyper charts can be pretty easy, and it gets difficult when you play the Anothers.
I think it's just because the game is telling you that there's more where that came from. When you clear a level 10 Another, that's it for that song. You're not gonna see it again in harder skill levels. When you play a Hyper, at some point, you'll get better enough that you'll play it again a couple of months/years later in a much higher difficulty.
So level 10 Hypers being harder than level 10 Anothers is like IIDX telling you, hey. We're not done yet. Ahahaha. It's tough out here