The stages are more alive than ever! From discovering prehistoric caves to exploring abandoned sewer plants, Fiend Folio adds new backdrops and changes to each floor to solidify their theme and feeling.
Basement, as the most classic and the easiest floor in the game, didn't get as much attention as some other floors. But that doesn't mean it didn't get plenty of additions as well!
A familiar floor originating from Wrath of The Lamb, Cellar is bustling with more creepy crawlies than ever!
Cellar was always a spider-infested place. But what are those? Bees?
It seems like bees and wasps now call the Cellar home as well! Throughout your journey across this place, you may encounter some rooms whose walls are covered with honey and patches of honeycomb.
Many enemies in Burning Basement leave flammable powder in a similar fashion to creep. The powder on its own is harmless, but as soon as it gets in contact with flames or an explosion, it gets really nasty!
Some rooms look more ancient than most. If you take a closer look, you can spot some prehistoric drawings on the rocks and walls have some fossils in them!
Wading through these caves, you'll also find many enemies that fill the air with Bubbles, like Wetstone and Lily Pads that have trouble supporting Isaac's weight and sink when stepped off of! Better hope Isaac knows how to swim…
With the constant smell of smoke permeating the parched, dusty air, this place feels like a wasteland… that is, when it isn't bustling with decrepit adversaries of all shapes and sizes! The Ashpit badlands are only for the brave of heart!
And tread lightly, some foes are truly frightening...
A sacred place defiled, occult magicks and undead horrors have made their home here. Battle against fanatic officiants, possessed tomes, vengeful spirits, gargantuan husks, and all kinds of psychic adversaries as you explore the once holy halls of the Mausoleum!
Back by popular demand! Antibirth's Teleporter Mausoleum design makes a triumphant return as a possible backdrop for several Mausoleum rooms!
A terrifying house of torture, heresy, and entirely too much black leather, Gehenna is bursting at the seams with untold numbers of cultists, demons, and just-plain-nasties out to end you once and for all! Can you make it through these blood-stained halls and live to tell the tale?
Utero is a truly bizarre and alien place where organs roam on their own! Brains and guts sliding about, Astroskull and Minimoons drifting aimlessly, Mobile Blood Cells on an endless march... And a heart's beat that echoes through the air...
Some of the walls in Utero have eyes! Mother is watching!
A place that was once alive now only harbors all that is revolting, Corpse is where the deceased and the rotting fester about...
Has the Corpse not been vile enough for you? Fear not (or perhaps, DO fear), because Morbus makes a debut as an alternate subtheme for Corpse in Fiend Folio: Reheated!
Morbus is a necrotic, festering place, home to that which should have never lived... or, perhaps, continued to live.
A new species has invaded Sheol! Psion and their lackeys have come from beyond the Void to cause chaos!
The Dark Room is a desolate place where memories come to die. Prepare to meet monsters from all chapters, ready to put you six feet under!
A place for everything that has been forgotten. Are you ready to fight your own nightmares? If yes, The Chest awaits with its lid open.
Although The Void is a fusion of all chapters, it also got some touchups! Rocks and pits are totally randomized and do not care about the backdrop!
Home & Ascent
Various Special Rooms in the game also got rehauled, giving them a completely new look!
Arcades greet you with their new appearance! Gamble, play, and have fun!
Challenge Rooms got a totally unique look! Feel like a champion and fight for your reward!
Secret Rooms are more ominous than ever! Who knows what you might find this time?
Crawl Spaces are more exciting than ever! Prepare for crazy puzzles, platform jumping, and unique enemies, all in the fantastic coat of one of seven different backdrops!
Luscious Crawl Space
This version of the Crawl Space is overgrown with plants!
Ossuary Crawl Space
This version of the Crawl Space appears to be a mass grave. Bones and skulls are everywhere!
Pipe Crawl Space
This version of the Crawl Space seems to be a part of an abandoned sewage system.
This version of the Crawl Space appears to be some kind of castle or dungeon.
This version of the Crawl Space looks like the dingy spaces inside of the walls of a home.
In Dice Rooms, everything is a dice! Rocks, pots, and even dice are made of dice!
I AM ERROR Room
I AM ERROR rooms, as their name suggests, are full of errors. Rocks are glitched and out of bounds!
Fiend Folio focuses on small things as well! Items like D12 are more enjoyable when playing with FF!
Peepee Dross Alt Rocks
When destroyed, they drop similar things as those of regular poop-filled buckets in Dross, but spawn Striders and Small Leeches instead of Drips and the projectiles are yellow and leave harmful creep where they land.
Morbus Alt Rocks
When destroyed, a tooth in Morbus may spawn:
Chapter 6 Alt Rocks
When destroyed, a gravestone in Dark Room may spawn:
When destroyed, a doll in The Chest may spawn:
- Black Bony
- Naked Curdle
- Detached Nuchal
- Bone Heart
- Cursed Penny
- The Bomb Rock texture for the Primitive Caves appears to have a small fossil resembling the mini-boss Wrath.
- The Large 2x2 sized rocks found in Dice Rooms and created by The D12 and Eternal D12 appear as monuments to the D100item.
- One of the Fool's Gold Rock in Mausoleum resembles a golden statue prop found in Amnesia: The Dark Descent.
- Another Fool's Gold rock appears as the Dark Arts item stabbed into the rock.
- The pillar textures in the Arcade appear as broken down game cabinets for Super Meat Boy and The End is Nigh, two games also made by Edmund McMillen.
- The texture of the Library's Super Special Rock after its been damaged shows a hammer-shaped hole in the pages, referencing The Shawshank Redemption.
- Some Fool's Gold rocks in Trash Depths reference Bitcoin and a portrait of a Bored Ape, an infamous NFT.
- Rocks in the Gehenna floor sometimes comprise of various torture devices; these include:
- Wooden horse.
- Judas cradle.
- Stretcher table.
- Iron Maiden.
- Marked Skulls in most rock sprite sheets (besides Depths, Necropolis and Dank Depths) have special sprites and can be found in very rare rooms. Furthermore, some of these sprites are easter eggs in reference to specific developers of Fiend Folio. A full list and gallery can be found here.
- Using XVI - The Tower? has the rocks use their un-modded textures, but re-entering the room fixes this.