Some sort of Super Hard mode or Wave mode that happens at the start of the 3rd loop. The game starts getting easy and repetitive after that amount of loops.
Wave mode would be enemies coming in big waves and lasts for the entire chapter.
Basically, 2 small questions...
1: Has anyone completed the "No-CHAD challenge yet"?
2: How exactly does "only red babies" work? Like does it start counting when I get 4 red babies?