Super Akuma Emperor

The speed violence is just this terrifying

It's so fast that even if you mash, it's hard to keep up, but if you keep trying, you can clear it. A chart where it's hard to get a feel for it.

Diesel

The stairs mixed in throughout and the final big stair are quite challenging. For the late spike, it's better to clearly distinguish between the parts to mash and the parts to hit accurately.