An unofficial guide to ChezzarCat's SpongeBob-themed Friday Night Funkin' mod: what it is, where to download V3, the full song list, and the lore behind Spongephanes' party gone wrong.
Looking to play without downloading? Bikini Horrors currently requires the FNF engine — see our download guide for setup details.
Bikini Horrors is a fan-made mod for Friday Night Funkin', built around a twisted, parody version of Bikini Bottom. It borrows the rhythm-battle format that made FNF popular and reskins it with SpongeBob characters, horror-tinged visuals, and parody tracks inspired by mods like Sonic.EXE, Sonic Legacy, Mario's Madness and Hypno's Lullaby.
The mod is the work of solo creator ChezzarCat, and has gone through several major versions — most recently V3, subtitled "Fiesta en la Piscina" (Spanish for "Pool Party"), which expanded the mod past 40 tracks.
A self-styled "underwater god" named Spongephanes throws a party that spirals into a string of rhythm showdowns against twisted versions of familiar faces.
Standard FNF engine — hit the arrow prompts in time with the beat to win each musical face-off. No installation skill required beyond running the mod's engine.
Played for comedy as much as horror — exaggerated character writing sits alongside genuinely tense boss tracks and a handful of jump-scare beats.
The biggest release yet, adding a full new arc of songs, reworked stages, and several callback tracks. Full breakdown on the V3 page.
Official links to GameJolt and GameBanana, plus what you'll need to run it.
View download links →Every track across V1–V3, organized by arc and opponent.
Browse the tracklist →Spongephanes, Jose Juan, Bob el Triste and every character in the full cast.
Meet the characters →In a modding scene packed with creative takes on Friday Night Funkin', Bikini Horrors carves out its own niche by leaning hard into the absurdity of its source material. Most FNF mods stick to either pure horror or straightforward character parodies, but this one blends both — taking the familiar, cheerful world of SpongeBob and twisting it into something that's equal parts unsettling and hilarious. The result is a mod that doesn't just copy the aesthetic of horror mods like Sonic.EXE or Mario's Madness, but actually plays with the contrast between childhood nostalgia and genuine tension.
What really sets it apart is that it's a solo project. ChezzarCat has handled everything — the coding, the music, the character design, the stage art — without a team backing it up. That kind of single-vision development gives the mod a cohesive feel that larger projects sometimes lose. Every track, every character animation, every story beat reflects the same creative voice, which makes the whole experience feel more like a personal art piece than a community patchwork.
The crossover parody approach is another big draw. Instead of just dropping SpongeBob characters into the FNF engine and calling it a day, Bikini Horrors actively references and riffs on other popular mods. You'll spot callbacks to the structure of Hypno's Lullaby, the tone of Sonic Legacy, and the boss-rush intensity of Mario's Madness, all filtered through an underwater lens. It's a mod that knows its audience — people who've played enough FNF mods to recognize the tropes and appreciate when someone twists them in unexpected directions.
If you've never played a Friday Night Funkin' mod before, the setup is pretty straightforward. Here's what you need to do:
Head to the official download page and grab the latest version from either GameJolt or GameBanana. Both links host the same files, so pick whichever platform you prefer. Make sure you're downloading the most recent release — V3 is the current version.
Once the download finishes, you'll have a compressed archive (usually a .zip file). Extract it to a folder somewhere easy to find — your Desktop or a dedicated "Games" folder works fine. Don't extract it directly into your Downloads folder and then lose track of it.
Open the extracted folder and look for the executable file. On Windows, it'll be something like "BikiniHorrors.exe" or "FridayNightFunkin.exe". Double-click it to launch. On Mac, you might need to right-click and select "Open" the first time to get past the security warning.
Use the arrow keys (or WASD) to hit the notes in time with the music. The mod follows the standard FNF format — match the on-screen prompts to win each rhythm battle. Start on easier difficulties if you're new to rhythm games, then work your way up to the harder boss tracks.
The Friday Night Funkin' modding community is one of the most active corners of indie game development. New mods drop constantly, creators share work-in-progress builds on Twitter and Discord, and fans dissect every update within hours of release. Bikini Horrors fits right into that ecosystem. ChezzarCat posts development updates on social media, and the mod has built up a following among people who enjoy horror-comedy crossovers and parody content.
To stay updated on new versions, your best bet is to follow the official channels. GameJolt and GameBanana both notify you when a mod gets updated if you add it to your favorites or watchlist. You can also check back on this guide — we track version changes and update the download links whenever a new release drops. For discussions, the FNF modding community tends to cluster around Discord servers, Reddit threads, and YouTube comment sections. That's where you'll find people sharing tips, posting fan art, and speculating about what comes next in the Bikini Horrors storyline.
Yes, the mod is completely free to download and play. It's a fan-made project, not a commercial product.
No. Bikini Horrors runs on its own version of the FNF engine. You don't need to download the base game separately — everything you need is included in the mod files.
The official download links on GameJolt and GameBanana are safe. Just make sure you're downloading from those official sources and not from some random third-party site that might bundle in unwanted extras.
The mod is primarily built for Windows, but Mac versions are often available alongside the Windows release. Linux support depends on whether the creator includes a Linux build — check the download page for what's currently offered.
With V3, the full mod includes 40+ songs spread across multiple story arcs. Depending on your skill level and whether you're playing on easy or hard difficulty, a full playthrough can take anywhere from 2 to 4 hours.
No, Bikini Horrors is a single-player experience. Friday Night Funkin' mods are built around solo rhythm battles against AI opponents, not competitive multiplayer.
ChezzarCat has released multiple versions so far, which suggests the mod is still being developed. Whether future updates are planned depends on the creator — follow the official channels for any announcements.
The mod uses cartoon characters, but it's designed with horror elements and some mature themes. It's aimed at the general FNF fan community, which tends to skew older. Parents should check the content first if they're considering it for younger players.