Mega Man Zero 2 The Bombardment Aircraft. You start off leaping between moving shuttlecraft which shoot at you while you're using them as platforms, on top of Pantheons shooting at you on top of them, requiring perfect timing so as to not to be knocked into the massive Bottomless Pit.

Once past that section, you have to fight a miniboss who fires fast-moving, area-damage missiles at you until you hit it. When you hit it, it drops a row of bombs which can only be avoided by standing exactly where it was previously hovering. Then you navigate through a series of timed stage hazards that will eat right through your tiny lifebar and require expert timing to pass unharmed. Then you have to do a Hold the Line section protecting Ciel for 90 seconds, which counts for basically your entire mission score. If she gets hit, goodbye A or S rank.