Bit confused about a certain type of room in the game

[Brigador Lemur]

Well I have been playing this game for quite a while now and I have been encountering a room that just confuses me a great deal.
When you enter it, there's a lot of blood on the floor and on the wall and there's also a set of spikes in the middle.
Also, when I exit the room and look at the map, it shows that room with what looks like a thick bloodstain or something.
Can someone tell me what the purpose of this room is?

[Node Graph out of Date]

If you stand on the spikes a chest may appear.

[Brigador Lemur]

Messaggio originale di Basaran:

If you stand on the spikes a chest may appear.

Ah, okay.

[Pandize]

You can get some great items from a chest that drops if you walk on the spikes enough... It gave me brimstone :D

[kirbo]

The spikes take a whole heart and sometimes you have to stand on them various times

[Maha.j2]

Messaggio originale di Basaran:

If you stand on the spikes a chest may appear.

Emphasis on MAY.

[BadEvilWrong]

If you have a heart and a half, the spikes will usually give you a chest from hitting it once. Other times, it'll take more than that to make it drop the chest. I don't usually use the room in general. When I spend three hearts for a chest, I want more than another half of a heart and a coin. I can't tell you how many times the sac room has screwed me over.

[Sethix]

Wait, The Room Can Give You Items? Or Can You Get Items Out Of Chests.

Messaggio originale di Bandi42Plays:

You can get some great items from a chest that drops if you walk on the spikes enough... It gave me brimstone :D

[Cryten]

Items out of chests, red chests may give you demon items or gold chest may give you a item room item, boss item or fate. Most often you get grey chests which just give you some coins and maybe a bomb/heart/key.

[Resurii]

Standing on the spikes may give you a chest. I did not bother though. I love my hearts. :)

[Awsomesawse]

Those rooms suck unless you have spare hearts lying around. Feel free to try your luck if that's the case. Also, watch out for a dead cat...

[Vq.| Yung Chef Turtleneck]

Messaggio originale di Awsomesawse:

Those rooms suck unless you have spare hearts lying around. Feel free to try your luck if that's the case. Also, watch out for a dead cat...

9 lives is the worst possible item.

[Resurii]

Messaggio originale di Cam ron Jefferspin Zarchming:

Messaggio originale di Awsomesawse:

Those rooms suck unless you have spare hearts lying around. Feel free to try your luck if that's the case. Also, watch out for a dead cat...

9 lives is the worst possible item.

Damn right.

[Brigador Lemur]

Messaggio originale di Cam ron Jefferspin Zarchming:

Messaggio originale di Awsomesawse:

Those rooms suck unless you have spare hearts lying around. Feel free to try your luck if that's the case. Also, watch out for a dead cat...

9 lives is the worst possible item.

Yeah, it is a really bad one to get and should be avoided at all costs.

[Awsomesawse]

Messaggio originale di Cam ron Jefferspin Zarchming:

Messaggio originale di Awsomesawse:

Those rooms suck unless you have spare hearts lying around. Feel free to try your luck if that's the case. Also, watch out for a dead cat...

9 lives is the worst possible item.

http://steamcommunity.com/app/113200/discussions/0/828925849225058171/