Crawl Space

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Crawl Spaces (also known as Retro Treasure Rooms) are small secret rooms that can be entered by touching trapdoors with ladders in them. They can be found in 5 different ways:

  1. Using the We Need to Go Deeper! activated item (10% chance)
  2. Using the Ehwaz rune (8% chance)
  3. Bombing a Clean Bedroom rug (100% chance)
  4. Added in Afterbirth Bombing a Dirty Bedroom rug (unknown chance)
  5. Destroying a rock (unknown very small chance)

Crawl Spaces only have one layout: They consist of 2 ladders and an item, chest, trinket, or various pickups. These rooms are viewed from the side, rather than from above like the rest of the game, and Isaac will experience gravity pulling him to the floor while he is not walking on top of one of the ladders. Under the effects of flight, this gravity has no effects. However, Isaac cannot fly over the walls or floor.

Mechanics[edit | edit source]

When entering a room pre-determined to contain a Crawl Space entrance, an RNG roll is made using the floor seed. This value will be shifted and divided, until its final result is in the grid range for the current room (ie: 128 tiles for 1x1 rooms, or 16x8). If said tile value is tied to a simple rock (not tinted, not a prop), then access to the Crawl Space will be granted upon destroying that rock. Only one room per floor has the right to spawn a Crawl Space, and not every floor is given one during the initial generation, even though every floor has also a Crawl Space and a Black Market ready in queue. The tile value can also be tied to props (empty tiles, doors, pots, void tiles, spikes, metal blocks, ...), but the Crawl Space won't spawn unless it's below a simple rock.

Layouts[edit | edit source]

Notes[edit | edit source]

  • Crawl Spaces may sometimes lead to a Black Market.
  • There is only one Crawl Space room per floor. Thus, if you find two trapdoors with ladders on the same floor, they will lead to the same Crawl Space. When you exit the Crawl Space, you will come out from the entrance you came in from.
  • There is no map in the Crawl Space, similar to the Black Market, the I AM ERROR room, the Devil Room, and the Angel Room.
    • This is because the Crawl Space does not technically occupy a fixed location on the floor relative to other rooms; Isaac is, in a sense, teleported to the Crawl Space when he touches the trapdoor.
  • It is possible to enter Black Market through a crawl space even when there is no path to it. By using two bombs, the player can clip out of bounds and then walk underneath the crawl space room.
  • Crawl spaces can appear in Greed mode as well.
  • Added in Afterbirth Rocks with Crawl Spaces under them will flash while holding the Added in AfterbirthShiny Rock Shiny Rock.
  • Added in Afterbirth The chance to find a Crawl Space upon destroying a rock can be increased with the Added in AfterbirthStud Finder Stud Finder: 1 in 100 with Added in AfterbirthMom's Box Mom's Box, 1 in 200 otherwise.

Gallery[edit | edit source]

Trivia[edit | edit source]

  • The layout of the Crawl Space is a direct visual reference to the treasure rooms in the Legend of Zelda for the NES.
  • Crawl Spaces are referred to within the game files as "Item Dungeons".

Seeds[edit | edit source]

 PC  Greed mode onlyGreedier mode only Q16B 7688 (Southeast corner after starting the first wave)

Bugs[edit | edit source]

Bug Bug! If Isaac's hitbox is small enough (by using One Makes You Smaller pills), it's possible to travel through the walls and ceiling to access the Black Market. In Added in Afterbirth † the walls are much harder to clip through, but it can still be done with high speed and help of the stairs or flight.

References[edit | edit source]

SmallIsaac.png Rooms SmallIsaac.png

Boss Room Icon.png
Boss Room
Mini-Boss Room Icon.png
Mini-Boss Room
Treasure Room Icon.png
Treasure Room
Shop Icon.png
Arcade Icon.png
Challenge Room Icon.png
Challenge Room
Boss Challenge Room Icon.png
Boss Challenge Room
Curse Room Icon.png
Curse Room
Sacrifice Room Icon.png
Sacrifice Room
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Secret Room Icon.png
Secret Room
Super Secret Room Icon.png
Super Secret Room
Library Icon.png
Devil Room Icon.png
Devil Room
Angel Room Icon.png
Angel Room
Vault Icon.png
Dice Room Icon.png
Dice Room
Bedroom Icon.png Bedroom2 Icon.png
Room 1x1.png
Grave Room
Super Secret Room Icon.png
Boss Rush
Super Secret Room Icon.png
Crawl Space
Super Secret Room Icon.png
Black Market
Super Secret Room Icon.png
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