A lot like Rockman 9's DLC for Endless Attack. You see how many Screens you can get through before death.
You'll end up going through the teleporter a lot to go through different variety of Screens. Like 9 again, it's usually random.
Cresent Moon and Sunset. Backgrounds are unique for this mode too. Along with a few surprises for certain screens.
Bosses are random like 9 for every 30 Screens. I fought Strikeman my first time with the mode. I probably won't end up submitting any Rankings until it's official released.