Here's a fun one from the front page (this post). Rule 3: If the Secret Room neighbors only 2 rooms (the Top Secret Room does NOT count), then one of the 2 rooms must be at RIGHT side neighbor of the Under the effects of flight, this gravity has no effects. Binding of Isaac: Rebirth Wiki is a FANDOM Games Community. Secret Room on (Spoiler) Dark Room Secret Room in a fairly difficult floor to find it. After defeating an Angel spawned in a Super Secret Room, the music will not return to the floor's regular music. http://boop.info/pageisaac/secretroom.html 12 7 7 comments Best Add a Comment Bosses However if you are unsure about the spawning rules, and want to see how it's done, using the tool is a good way to learn patterns! They also can only be entered if Isaac has one or less red heart. This mirror can be broken by explosions, but also can be entered to explore the Mirrored World, a replica of the current floor, to find Knife Piece 1. randomly (8% chance)/ on certain patterned tiles (100% chance once per floor); Using Rune of Ehwaz randomly (10% chance)/ on certain The gameplay is structured as a series of randomly generated dungeons, with each floor offering different challenges, enemies, and items. 4 Shopkeepers, 1 Red Fire Place, and 2 random Bomb pickups. So the generation seems to sometimes do what it wants. Valve Corporation. This tool will predict your secret room location, it's not perfect, as sometimes the top secret room can affect the location. Ultra Secret Rooms are very secret rooms, found when venturing one Red Room outside the normal map using the Red Key, Crystal Key, Cracked Key, or the Soul of Cain, or by teleporting to it with XVIII - The Moon?, or by teleporting to it using Telepills while in the mirrored version of Downpour/Dross II. Well I spent the last few weeks getting a VPS and building my own host/website. yo dawg, i wanted to cover "secret rooms" in my guide, but you already have pefected it, i linked you, hope its ok! They can rarely be found under destroyed rocks. how to find an ultra secret room,the quickest guide step 1:find red key step 2:get lucky 58 [deleted] 1 yr. ago Absolutely 15 thetdotbearr 1 yr. ago cracked orb babyyyyy PresentCertain9925 1 yr. ago No step 2 is use consul command for infinite charges [deleted] 1 yr. ago These Rooms are viewed from the side, rather than the top like the rest of the Rooms in the game. I have tested it as much as I can and aside from the less than 1% chance stuff (like if there are no secret rooms, or when there is an end room loop) the script has performed very well! The Mineshaft Room is a single special room found on the second floor of Chapter 2.5 only if Isaac already has Knife Piece 1. The game's difficulty is notorious, with players often having to restart from the beginning after dying. The doors of the Ultra Secret Room are opened automatically only when approached from the outside. WebSuper Secret Rooms are always only attached to ONE regular room. When unlocked, these Rooms appear attached to a Main Path Boss Room once the Boss is defeated (or appear at the end of Alternate Path Chapter). How Long To Beat Star Wars Battlefront 2 Achievements. Challenge Rooms can only be entered if Isaac's total health (red, black, and soul hearts) is equal to or greater than his number of heart containers. Objects Arcades can only spawn on even floors (Basement II, Caves II, Depths II, Womb II, etc) or XL floors if the previous floor was completed with 5 or more coins. 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). The Stairway will spawn a ladder in the starting room of each floor that leads to each floor's Angel Room shop, a Shop that sells Angel deal items, has angel-related pickups, sometimes includes a coin beggar or a Confessional, and always includes an angel statue. The Binding of Isaac: Rebirth is a popular indie game that has gained a significant following since its release in 2014. WebSecret Rooms are rooms that are not normally visible on the map and are usually accessed by bombing a wall leading to them. I think i can't play Isaac without the Wiki! It is only visible to you. 1 / 2. It is a good item to have in the later stages of the game when the enemies are stronger. If the bomb explodes and creates a hole in the wall, that should be the entrance to the secret room. Creating a Crawl Space within a Crawl Space with, There is no map in the Crawl Space, similar to the, 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's well understood that the USR has to be adjacent to at least two red rooms you can go directly into. Activated Collectibles Passive Collectibles The Binding of Isaac: Rebirth Achievements Challenges Completion Marks Items Trinkets Characters Chapters Rooms Transformations Attributes Bosses Monsters Pickups Modes Curses Objects Seeds Effects Endings Copyright 2015 - 2024 FreshersLive.com All Rights Reserved. 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. This is a map showing some of the locations you might find an Ultra Secret Room on the given floor layout. One of the most exciting aspects of the game is the hidden rooms that players can find in each level. Just a heads up.Error info: Script error. 5 days ago. Crawl Spaces are referred to within the game files as "Item Dungeons". If there are no spaces for a secret room to connect to 3 rooms, it looks for 4 connections, then 2, then 1. Each rooms adjacent to a Secret Room must satisfy these requirements, so if one room near a suspicious gap in the map fails these requirements, then look elsewhere. All rights reserved. Tears can be modified and upgraded by finding items and power-ups throughout the game. Characters Only real way to know is if the super secret room is only next to one room, but the way I coded it, I would have to do some major changes to be able to show it. Rarely, the Crawl Space will lead to a Black Market. After more than a year of using this method, me and my friend have concluded that it is only about 80-90% reliable. Chapters The Binding of Isaac: Rebirth How to Find Ultra Secret Rooms Then, draw the possible neighboring red rooms for each of your special rooms (without looking at the rooms themselves, only look at the map! 1 Shopkeeper, 2 Fire Places, and 1 Reward Plate. Red Key or Cracked Keys must be used before the bombs, as otherwise explosions won't have an effect. However, Isaac cannot fly over the walls or floor. The layout of the Crawl Space is a direct visual reference to the treasure rooms in the Legend of Zelda for the NES. Objects Players control a character named Isaac as he battles his way through a basement filled with monsters, puzzles, and traps. The Curved Horn is one of the two most sought after Trinkets in The Binding of Isaac: Rebirth. If the player manages to beat Mom in under 20 minutes from the start of the run (visually indicated by the clock icon that appears during the cutscene between floors), a crack will open in the wall of the Boss Room upon defeating her, allowing entry to a large Room with 2 or 4 item pedestals in the center or the corners, often blocked by rocks or spikes. Binding of Isaac: Rebirth Wiki is a FANDOM Games Community. Using We Need to Go Deeper! Completion Marks ; when teleported into, a pathway of Red Rooms back to the rest of the level will be opened automatically. The game has also spawned numerous expansion packs and sequels, such as Binding of Isaac: Rebirth and The Binding of Isaac: Afterbirth. Just to add onto this, the secret room can actually exist in this situation, the only reason my script doesn't display it is because for the secret room to be anywhere it would be on the left of the vertical corridor, and the super secret room would have to be next to it. They sell various items in exchange for coins. The game is known for its unique art style, dark themes, and challenging gameplay. Good question. Now that we know the rules abided by ultra secret rooms, we can start looking at the map of our floor. Greedier Exit Rooms are almost exactly the same as the Greed Mode Exit Room, except they take 11 rounds to open. Secret Room on (Spoiler) Dark Room Secret Room in a fairly difficult floor to find it. The Angel Room has a chance to replace the Devil Room if certain conditions are met. Binding of Isaac is a roguelike video game developed by Edmund McMillen and Florian Himsl. However, the strategy is still more reliable than whatever nonsense is written on the wiki at this moment, and it seems like ultra secret rooms. Enter the full URL of your item or group's Polycount page, Enter the full URL of your item or group's reddit page, Enter the full URL to your item or group's Sketchfab page, This item has been removed from the community because it violates Steam Community & Content Guidelines. Obviously, the most reliable one the Red Key, but you can also use Cracked Key or Soul of Cain. Create an account to follow your favorite communities and start taking part in conversations. Has a new Door, no longer sharing a Door with Libraries. There are several different presets of Super Secret Rooms which can include the following: Multiple Red Hearts: These hearts increase the health of the player, which can come in handy in case of a tough battle. (115+ rare secret rooms to find! It is similar to the Secret Room in the way that they are not shown on the map when adjacent to it without the Spelunker Hat, and have to be opened either with explosives or the XRay Vision item. 1.5K. In the game, players control Isaac, a young boy who flees to the basement of his house to escape his mother's attempts to sacrifice him. (treasure room, shop, arcade, regular or super secret room etc). I'd guess the unexplored room is blocked to the right with a room connecting item room and shop above maybe? Super Secret Rooms replace the dead-end room that would require the 2nd most rooms walked through from the start room to access, and cannot be connected to the Secret Room. 1.5K. WebSecret Room (Item Pool) Edit Items in this pool can be found in the Secret Room . The basic idea is that Secret rooms are connected to more than one room, and Super Secret rooms are connected to only one. 1 / 2. My first rare secret rooms mod did so well I had to do the same for super secret rooms! In The Binding of Isaac: Rebirth, there are a lot of different types of rooms, such as the treasure room, the store, and normal rooms. The Crystal Key trinket opens red rooms too, but you can't control it so it won't be very helpful here. Press J to jump to the feed. 1. That is a bit of miss information, most of times it is just in a diagonal, ignoring the location of special rooms. Thanks alot! The Curved Horn is one of the two most sought after Trinkets in The Binding of Isaac: Rebirth. This tool will predict your secret room location, it's not perfect, as sometimes the top secret room can affect the location. This mod aims to add the excitement of finding a really rare room layout to the super secret rooms of Isaac. Drew the first 8 characters and jeez it took me more than I want to admit, hope u like em! Teleportation items can randomly teleport Isaac into Secret Rooms, and, Secret Rooms are revealed on the map with, Secret Rooms can exist next to all types of rooms except. Greed Exit Rooms start metal barred and unbombable, like miniboss rooms, but will be unbarred and accessible once ten waves of enemies are defeated. http://boop.info/pageisaac/secretroom.html 12 7 7 comments Best Add a Comment 81. r/bindingofisaac. 81. r/bindingofisaac. Planetariums have an additive and higher chance of spawning if the player avoids walking into Treasure Rooms. Who Is Swara Bhaskar Ex Boyfriend? One easy strategy to place the bomb correctly in large rooms is to position Isaac in a corner, walk along a wall, then place the bomb at the spot where the camera starts moving. The spot where the door should be will not be blocked by a rock or a hole in the ground. I am sorry the page doesn't look great on IE or maybe that is Firefox, but I did the entire thing in Chrome, and only noticed the differences when I had already pretty much finished it. and can only be revealed on the map with Cracked Orb, Book of Secrets wisps, and Rune Shard. However if you are unsure about the spawning rules, and want to see how it's done, using the tool is a good way to learn patterns! randomly (8% chance)/ on certain patterned tiles (100% chance once per floor); Using Rune of Ehwaz randomly (10% chance)/ on certain An entrance to crawl space found during the Mother's Shadow sequence. When I tried using this it instantly crashes and asks me to press F5, then repeat. On another note, if a Curse Room is adjacent to a secret room of any type, then a spiky doorway frame will connect the two. In order to find an ultra secret room, you will need an item/consumable capable of creating red rooms. While they are not guaranteed on every level, they are commonly found on the first few levels. While they are not guaranteed on every level, they are commonly found on the first few levels. This Room has a small chance to contain two items from the treasure pool that can both be collected, and a very small chance of containing no item pedestal at all, instead containing one poop pile, 3 Attack Flies, and various pickups, including one trinket. In The Binding of Isaac: Rebirth, there are a lot of different types of rooms, such as the treasure room, the store, and normal rooms. Modes The hardest way to find Ultra Secret Rooms more accurately is beat Ultra Greedier as Tainted Jacob). As with regular and super secret rooms, sometimes the game doesn't care about rules and spawns ultra secret rooms regardless of special room proximity. Angel Rooms contain an angel statue and an item, Soul Hearts, or Eternal Hearts. Sometime rooms can be "flooded" with water, blood, or lava depending on the Chapter. Using We Need to Go Deeper! If Isaac is currently holding an active item, completing a Room with enemies will add one charge. Red Rooms are special rooms created when using the Red Key (and Red Key wisps spawned with Book of Virtues), Crystal Key, Cracked Key, or the Soul of Cain. If any of you remember I released this script a little while ago; hosted on a poop free webhost that was riddled with ads and was just awful. There are some rooms in The Binding of Isaac: Rebirth that are difficult to find normally on a floor. Normal Rooms make up the majority of the Rooms on a floor. If you're going to attempt to find the secret rooms on that floor believing that the first of the 2 ideas above, be mindful about whether the super secret room could indeed fill in any of the potential third slots. They can be accessed directly by opening Red Rooms adjacent to them using Red Key or Red Key wisps, Crystal Key, Cracked Key, and Soul of Cain: entering a Red Room next to the Ultra Secret room will reveal its position and automatically open the doorway leading into it. every time I enter a secret room from this mod the game crashes. Sacrifice Rooms are special rooms that have a chance to spawn a Chest or other preset rewards after Isaac damages himself on the spikes featured at the center of the Room. Espaol - Latinoamrica (Spanish - Latin America), At least one of these red rooms must be connected to any special room except boss rooms, Both of these red rooms must be connected to at least one non-red room (but it cannot be the same one if it's the only non-red room both red rooms border with), Bright red square = red room near a special room, Dark red square = red room near a regular room, Question mark = possible ultra secret room location. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Because I haven't touched the super secret room stuff yet, it just doesn't show. 319. Seeds Use it! Additionally, instead of being located in the typical horseshoe pattern with at If a mod wants to pin this please feel free to do so. The door is permanently blocked after leaving the sub-area. Super Secret Rooms can have layouts from floors that Isaac hasn't unlocked yet. Another common room that isn't well known is the hidden room. Bosses Join. There are some rooms in The Binding of Isaac: Rebirth that are difficult to find normally on a floor. Rooms can come in various sizes; while normal-sized Rooms are the most common, double and quadruple-sized Rooms can also appear. They will often contain a unique arrangement of items, objects, or pickups. Black Markets also have a trapdoor to the next floor and various machines or beggars. 4. About 3/5 runs the SSR will be connected to the room directly before the boss room, shooting off in a direction that DOES NOT connect it to other rooms. WebThe Super Secret Room is a room type added in the expansion, Wrath of the Lamb. Spice Girls Where Are They Now? Items The official subreddit for Edmund McMillen's Zelda-inspired roguelite, The Binding of Isaac! Valve Corporation. Opening this door requires Dad's Key or the two key pieces from Angels. You are a really cool and talented man and I like you very much so. Golden Treasure Rooms can generate in Sheol with the Wicked Crown trinket equipped, and can generate in the Cathedral with the Holy Crown trinket equipped. If you are new to the game, we recommend starting with the default character, Isaac. There are 2 other Yellow Buttons located randomly on the same floor and pressing all 3 repairs the minecart's track allowing access through the blocked door. The game's plot is loosely based on the biblical story of the same name, in which Isaac is about to be sacrificed by his mother at the behest of a voice from above. Red key + 4.5 volt on The Chest or Dark Room is insane; since most generated rooms will have bosses you pretty much get your charge back AND can find treasure/Devil deal rooms, Another thing is that they prefer empty rooms to connect their red rooms to. how to find an ultra secret room,the quickest guide step 1:find red key step 2:get lucky 58 [deleted] 1 yr. ago Absolutely 15 thetdotbearr 1 yr. ago cracked orb babyyyyy PresentCertain9925 1 yr. ago No step 2 is use consul command for infinite charges [deleted] 1 yr. ago In this article, we will provide you with a step-by-step guide on how to find these hidden rooms. Rule 2: Secret Rooms are never horizontally 4 rooms away from the Starting Room. Prior to V1.7.5, Ultra Secret Rooms used the. PC 927Q 481S (Secret Room above Treasure Room is not attached to any others), PC 2CC7 S7YG (Secret Room is attached to only one room; located on the eastern wall in the most eastern room starting from the spawn room), PC 419H 1DQM (Take the Red Key in the Curse Room left of the starting room, then use it on the right-hand wall of the Curse Room to reveal a Red Room which opens the Ultra Secret Room), Achievements They tend to spawn closer to the Boss Room. This item will only be visible to you, admins, and anyone marked as a creator. Trinkets Each floor of the game is made up of a number of Rooms. http://boop.info/pageisaac/secretroom.html If any of you remember I released this script a little while ago; hosted on a poop free webhost that was riddled with ads and was just awful. The items found in these rooms can significantly help the player's character in the game. Chapters Black markets are accessed through Rare Crawl Spaces. At least 4 "holes" in the map with pretty good odds. I would really enjoy any feedback (good and bad) you guys might have. Planetariums are similar to Treasure Rooms, but only contain one powerful celestial item belonging to the Planetarium (Item Pool), items exclusive to Planetarium Rooms. Pills: These pills can have various effects on the player's character. Rule 3: If the Secret Room neighbors only 2 rooms (the Top Secret Room does NOT count), then one of the 2 rooms must be at RIGHT side neighbor of the Repentance added a new type of secret rooms, which can only be found via certain items that are able to create red rooms. Obviously, the most reliable one the Red Key, but you can also use Cracked Key or Soul of Cain. This item has been removed from the community because it violates Steam Community & Content Guidelines. Devil Rooms can also contain Red Chests, Black Hearts, spikes, or monsters along with its signature devil statue. Using Teleport 2.0 when all other rooms have been explored guarantees to be teleported in an I AM ERROR room. Espaol - Latinoamrica (Spanish - Latin America), All entrances of the room, must be accessible naturally (must have accessible floor and can't have rocks, mushroom's etc, blocking it). If you believe your item has been removed by mistake, please contact, This item is incompatible with The Binding of Isaac: Rebirth. WebRule 1: Secret Rooms are never neighboring to the LEFT side of the Boss Room or the Top Secret Room. 1 Shopkeeper surrounded by 4 Cobwebs, and 3 random, 1 Shopkeeper, 2 Fire Places, 4 Rocks in each corner, and 3 random, 1 Shopkeeper, 2 Fire Places, 2 Red Fire Places, and a. This mod aims to add the excitement of finding a really rare room layout to the secret rooms of Isaac. The Crystal Key trinket opens red rooms too, but you can't control it so it won't be very helpful here. Sometimes even items. WebLocating the Secret Room Sometimes the location is obvious, sometimes you have to guess The room is normally unmarked on the map, although the Treasure Map will show it automatically. 1.5K. Enter the full URL of your item or group's Facebook page, Enter the full URL of your item or group's Twitter page. there are tons of rare room layouts in Isaac but only a very small amount of rare super secret rooms, I thought it was about time that changed! By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. If other rooms exist adjacent to it, the doors will not open from inside the Ultra Secret Room without bombing them or returning from the outside. They may also have Fire Places or Red Fire Places which have a chance to drop Coins, Red Hearts, and more when extinguished. If you have a related Youtube channel, enter the URL. There is about a 20% chance that it will select the next most likely spot and another 20% for the one after and so on. 1 Eternal Heart: These hearts are similar to Red Hearts, but they are not refillable. Press J to jump to the feed. Press question mark to learn the rest of the keyboard shortcuts. Seeds 5 days ago. They always contain one item from the Greed "Boss" Item Pool, and require no keys to open, being open from the start of the floor. One of the most exciting aspects of the game is the hidden rooms that players can find in each level. (The I AM ERROR Rooms is a running gag within games that is a reference to the "I AM ERROR" easter egg in The Legend of Zelda (1987). Note that the type of Super Secret Room is not limited to certain floors it mimics (e.g. all TBOI characters part 1. also, i barely get red key and go alt paths. Transformations Secret Rooms usually contain Shopkeepers and various pickups. The official subreddit for Edmund McMillen's Zelda-inspired roguelite, The Binding of Isaac! Each alternate floor has 11 unique layouts (12 in Downpour). WebThe Binding of Isaac Rebirth - Rooms Contents 1 Normal Rooms 2 Special Rooms 2.1 Boss Rooms 2.1.1 Mini-Boss Room 2.2.1 Normal/Golden Treasure Rooms 2.2.2 Silver Treasure Rooms 2.2.3 Red Treasure Rooms 2.3 Planetariums 2.4 Shops 2.5 Challenge Rooms 2.6.1 Normal Challenge Room 2.6.2 Boss Challenge Room 2.7 Curse Rooms An already unlocked Treasure Room with a silver doorframe and a normal locked treasure room are also available. Obviously, the most reliable one the Red Key, but you can also use Cracked Key or Soul of Cain. WebThe Binding of Isaac Rebirth - Rooms Contents 1 Normal Rooms 2 Special Rooms 2.1 Boss Rooms 2.1.1 Mini-Boss Room 2.2.1 Normal/Golden Treasure Rooms 2.2.2 Silver Treasure Rooms 2.2.3 Red Treasure Rooms 2.3 Planetariums 2.4 Shops 2.5 Challenge Rooms 2.6.1 Normal Challenge Room 2.6.2 Boss Challenge Room 2.7 Curse Rooms If you're going to attempt to find the secret rooms on that floor believing that the first of the 2 ideas above, be mindful about whether the super secret room could indeed fill in any of the potential third slots. And they're typically near the boss room. This is obviously always the case in your Type B and C examples, but you'll notice in the first two Type A examples that both red rooms could be entered from somewhere other than the highlighted room. WebThe Super Secret Room is a room type added in the expansion, Wrath of the Lamb. Each Super Secret Room has set drops depending on the floor. This item will only be visible to you, admins, and anyone marked as a creator. So the second close room can be pretty far from the boss room (depends on map). Once the Room is entered, Isaac will have to face off against Mega Satan. WebLocating the Secret Room Sometimes the location is obvious, sometimes you have to guess The room is normally unmarked on the map, although the Treasure Map will show it automatically. Secret Room Finder - Rerelease! Depending on the number of pips imprinted on the face of the large red die embedded in the floor, stepping onto the center of the die activates an effect. This is obviously contradicted by the third Type A example, but this is remarkably rare. Regular Secret Rooms are usually located next to 2 to 4 rooms, while Super Secret Room s can only be next to one room; they are placed on one of the dead ends generated on the map, similar to other Special Rooms. 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. The following room maps were made using Basement Renovator[1] for cleaner viewing; note that all Urns you see will be Mushrooms when encountered in-game. I never treated them as such, but they might be. These mods always crash the game for me randomly when using modded characters. Curses With these rooms I mostly stuck to the vanilla style whilst still trying to keep them interesting, adding a lot of variety and being exciting to find, there are a few wacky ones in there too but not too many. Does the mod work? Another common room that isn't well known is the hidden room. Well I spent the last few weeks getting a VPS and building my own host/website. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. These Rooms contain an entrance to the Alternate Path Floors. They can be upgraded through the Donation Machine, which can be commonly found in the Shops and sometimes in an Arcade. My aim, with this guide, is to point you to the right direction on finding the Secret Room and Super Secret Room on Binding of Isaac: Rebirth, of course, using (poorly ;) ) edited screenshots. ), besides the boss room. Most ultra secret rooms contain angel items, making them very rewarding to look for. If you believe your item has been removed by mistake, please contact, This item is incompatible with The Binding of Isaac: Rebirth. Endings. PC Q16B 7688 (Southeast corner after starting the first wave), Achievements https://github.com/Tempus/Basement-Renovator, 1 Shopkeeper, 2 Fire Places, and 3 random, 1 Shopkeeper, 2 Fire Places, 4 Rocks and 6 random, 1 Shopkeeper, 2 Fire Places, 4 Rocks, and 9 random. Super Secret Rooms are most likely to be found either at the end of a series of rooms that lead to a dead-end, and is particularly likely to appear near the Boss Room, as they are the second room type to be placed on a map during Map Generation, and are therefore placed far away from the room Isaac starts in. Why Did Nicola Walker Leave Unforgotten? In order to find an ultra secret room, you will need an item/consumable capable of creating red rooms. Create an account to follow your favorite communities and start taking part in conversations. In Rebirth, if you can't reach where the entrance to the room would be (without crossing a gap or blowing stuff up) then there definitely isn't a room there. Step 4: Place a bomb where the door should be. Regular Secret Room layouts cannot appear on these floors. This tool will predict your secret room location, it's not perfect, as sometimes the top secret room can affect the location. If there is no hole, then there is no secret room there. 1 Shopkeeper, 5 Mushrooms, 4 Cobwebs, and 3 random Pickups. I'll add further edits to this comment. The Red Key Rooms don't open without these items, and are spawned into existence at the closest red outline door when the item is used. I highly suggest everyone to watch their video https://youtu.be/4_5EZwWcKBk?t=215. Bedrooms contain a bed that can be used once to restore all of the player's health, or if they have no red hearts, they give you 3 soul hearts and add one charge to their active item.