[spoiler]Apparently, this level with DANGER on it is actually none other than.
THE YELLOW DEVIL!Although I'm unsure if this is actually an endless fight (where he actually can die in a certain # of times killed), or if its actually an endless battle until you die.
CONFIRMED: He does have multiple phases like those Final Dr. Wily fights. His final phase was the toughest phase I've fought. I did not really count when I was fighting it, but it seemed like there were at least 5 phases.
1 - Normal Path Phase.
2 - Faster Path Phase.
3 - Sometimes throws 3 blocks at once at you.
4 - Uses an X like path movement.
5 - The final phase. The blocks stop in the middle of the path for a second. Then suddenly start moving again.
Yea, that sounds about right.
[/spoiler]
It's a good thing that DANGER part is actually optional. It was hard for me the first time I tried it.
This actually may be a good challenge for Vixy to try.