Rocks

* Blocks movement and projectiles unless the player has flight or spectral tears respectively.
* Can be destroyed with explosions and certain items like the , , , or .
* Can fill in a 1-block wide gap when pushed in the right direction by an explosion, or with one of the abilities that allows destruction by walking onto the rock.
	+ Note: With these items, it is important to walk in the direction of the gap.
* Small chance to reveal a Crawl Space when destroyed.
* Destroying 100 rocks will unlock the  trinket.

## Tinted Rocks

Sometimes referred to as "Marked Rocks", they are always marked with an "X", and in some levels slightly tinted/discolored. These rocks are much less noticeable in Womb, Utero and Scarred Womb due to them being the same color as the surrounding rocks, but can still be distinguished by the "X" on the bottom right. Only one tinted rock can spawn per room.

* Destroying 10 Tinted Rocks will unlock .
* Destroying 100 Tinted Rocks will unlock .
* Multiple tinted rocks can spawn in one room by using

**Found in:** Every Stage

Tinted Rocks have a chance to spawn 1-3 of the following when destroyed:

* Soul Hearts
* Keys
* Bombs
* Locked Chests (only one)
* Chests (only one)
* Tinted Rock Spiders (Mines and Ashpit only)
* A combination of any of the items mentioned above
* (after it has been unlocked)
	+ Not picking up The Small Rock right after it spawned doesn't prevent other tinted rocks from spawning it again. Even though the chances are very small, you can exploit this to obtain multiple Small Rocks.

## Super Special Rocks

Super Special Rocks are Tinted Rock variants whose smaller marks and lack of discoloration make them much harder to spot. Super Special Rocks take two bombs to blow up and drop the contents of two Tinted Rocks, with the exception that a single chest or  appear without extra rewards.

Only one super special rock can spawn per room, and normal tinted rocks cannot appear in the same room.

In Chapter 4 and Chapter 4.5 Super Special Rocks are almost identical to Tinted Rocks, making them easier to spot in these chapters.

Super Special Rocks are unlocked by the achievement  5 Nights at Mom's, which requires you to get a 5-win streak ( 3-win streak), using a different character each time.

### Notes

* Using normal Characters to get a win and then using its tainted counterpart won't work, only one of them will work for obtaining the achievement.
* The achievement does not unlock in Co-op Repentance even if the three wins were done with different characters for each player.
* Regardless of DLC version, an unlocking streak must be done with unique characters. That means each successful run must be performed with a new character for it to qualify.

## Bomb Rocks

Act like rocks.

**Found in:** Small chance of replacing any rock on any chapter.

Bomb rocks can be found anywhere a normal rock can spawn. They can only be destroyed by explosions and "stompy" items, like normal rocks. When they are destroyed, they create an explosion. Note that destroying a bomb rock next to a hole does not create a bridge as with normal rocks.

## Spiked Rocks

Spiked Rocks are variants of normal rocks which hurt Isaac on contact, even if he's flying.
They can fill in a 1-block wide gap like ordinary rocks, but the spikes will remain and Isaac will take damage as he steps on them. If they are located in a room with Pressure Plates, after all are pressed, the spikes will retract into the interiors of the rock. If a Crawl space is generated with the same rock used to fill a gap, the bridge will not be spiked.

 will remove the spikes from the rocks.

If spiked rocks are crushed by being Stompy, having  or , or using , they do not always deal damage, depending on Isaac's speed, size and the angle touched from.

**Found in:**

* Caves
* Mausoleum
* Boss Rush

## Fool's Gold Rocks

Act like rocks. They have a small chance of replacing normal rocks, sometimes in small clusters, once unlocked.

* Unlocked by:  Defeat Mega Satan as  Tainted Lilith

Fool's Gold Rocks will spawn the following when destroyed:

* 2-4 Pennies

## Urns

Act like rocks.

**Found in:**

* Cellar
* Cathedral
* Arcade

When urns are destroyed, the following events can occur:

* Nothing (68.00%)
* One random coin spawns (4.84%)
* Two random coins spawn (4.84%)
* spawns (2.50%) (can only happen once per run)
* spawns (0.50%) (can only happen once per run)
* One spider spawns (9.67%)
* Two spiders spawn (9.67%)

### Notes

* If spiders spawn from destroying an urn after clearing a room, they will disappear if Isaac leaves and re-enters the room.

## Mushrooms

* Act like rocks.

**Found in:**

* Catacombs
* Mines
* Secret Room

When mushrooms are destroyed, the following events can occur:

* Nothing (68.00%)
* One Pill spawns (9.67%)
* spawns (2.50%) (can only happen once per run)
* /  spawns (0.50% chance)
	+ Only one of each collectible will drop per run. However, it is possible to get both collectibles in the same run.
	+ There is a 2.72% chance for a mushroom in a Secret Room to drop  instead of a Magic Mushroom or Mini Mush. Only one will drop per run.
* One poisonous gas effect spawns (19.33%)
	+ This effect knocks Isaac back and deals half a heart of damage. (It does not count as an explosion.)

## Skulls

Act like rocks.

**Found in:**

* Necropolis
* Sheol
* Gehenna
* Devil Room

When skulls are destroyed, the following events can occur:

* Nothing (68.00%)
* One random card / rune spawns (9.67%)
* One Black Heart spawns (2.50%)
* /  spawns (0.50% chance)
	+ Only one of each collectible will drop per run. However, it is possible to get both collectibles in the same run.
* One Host enemy spawns (19.33%)

### Notes

* Prior to Booster Pack #5, skulls had a chance of spawning Mushrooms instead of Hosts.

## Marked Skulls

Act like rocks.

* Unlocked by:  Defeat Mother

Once unlocked, a single skull marked with a small "x" will appear in Depths, Necropolis, and Dank Depths II or XL. When destroyed, it will drop .

* If Isaac has , it will drop an identified Telepill. If Isaac also has , it will drop an identified ??? pill.

### Notes

* Cannot be re-rolled by .
* Marked Skulls may spawn in Red Rooms on Depths,The Void,Necropolis, and Dank Depths, even while not in the II or XL floor.
* Marked Skulls have different appearances when spawned on other floors, e.g. manually via the console or during the DELETE THIS challenge. Some of these are Cut Content from the original game.
	+ For example, it will appear as a white urn in Basement, as a red mushroom in Caves, or a horizontally flipped polyp in Womb.
	+ It will appear as a regular bucket in Dross with no visual difference.

## Polyps

Act like rocks.

**Found in:**

* Utero
* Corpse

When polyps are destroyed, the following events can occur:

* Nothing (68.00%)
* Random heart (5.10.0) spawns (9.67%)
* spawns (2.50%) (can only happen once per run)
* /  spawns (0.50% chance)
	+ Only one of each collectible is encounterable per run. However, it is possible to get both collectibles in the same run.
* A ring of 6 red projectiles and a puddle of red creep (19.33%)

When polyps in the Corpse are destroyed, the following events can occur:

* Nothing
* Rotten Heart spawns
* spawns (can only happen once per run)
* or  spawns
	+ Only one of each collectible is encounterable per run. However, it is possible to get both collectibles in the same run.
* Launches 6 Small Maggots in all directions and a puddle of green creep

## Buckets

Act like rocks.

**Found in:**

* Dross

When buckets in Downpour are destroyed, the following events can occur:

* Nothing (68.00%)
* One random coin spawns (4.84%)
* Two random coins spawn (4.84%)
* spawns (2.50%) (can only happen once per run)
* spawns (0.50%) (can only happen once per run)
* One Strider spawns (4.83%)
* Two Striders spawn (4.83%)
* One Small Leech spawns (4.83%)
* Two Small Leechs spawns (4.83%)

When buckets in Dross are destroyed, the following events can occur:

* Nothing (68.00%)
* One random coin spawns (4.84%)
* Two random coins spawn (4.84%)
* spawns (2.50%) (can only happen once per run)
* spawns (0.50%) (can only happen once per run)
* One Drip spawns (4.83%)
* Two Drips spawn (4.83%)
* One Small Leech spawns (4.83%)
* Two Small Leechs spawns (4.83%)

In addition to these rewards, whenever a full bucket (i.e. filled with water or filled with poop) is destroyed or picked up by a Polty, 6 projectiles will always spawn in a small radius.

### Notes

* If a bucket would normally spawn striders, but is in a dry room, normal Spiders will spawn instead.

## Unlockable Achievements

* Lucky Rock - Destroy 100 rocks.

* Mystery Gift - Destroy 500 rocks.

* Mr. Mega - Destroy 10 Tinted Rocks.

* Blue Bomber - Destroy 10 Tinted Rocks and defeat Mom's Heart 11 times.

* A Small Rock - Destroy 100 Tinted Rocks.

* 5 Nights at Mom's - Get a 5-win streak ( 3-win streak), using a different character each time (Mega Satan victories do not count if the Void portal doesn't spawn).

* Fool's Gold - Defeat Mega Satan as  Tainted Lilith.

## Gallery

* Rebirth concepts, including Bomb Rocks.
* Tinted rock appearances throughout the floors