The Hollows 4

The Hollows 4 is a level in The End is Nigh. It's connected to The Hollows 3 from the top and The Hollows 5 from the bottom.

Collectables
When you first get to the level, go right through an invisible wall. In the first secret area, your view mostly blocked. Just jump over the spikes and get to the end. In the second secret area, follow the blue light. It will mislead you several times before it leads you on the correct path to get a Mega Tumor.