FNF Underswap CrossBones Rhythm

rhythm music

Runs in your browser — no download required.

Developer: Crimson Reign Labs

Published: 2024-06-20

Updated: 2026-06-12

Reviews

Underswap X Friday Night Funkin’ Vs CrossBones delivers a solid rhythm experience with its original soundtrack and well-designed charts. The skeletal theme adds charm, and the two modes give good replay value. It is a clean mod that respects the source material while offering something new. Perfect for quick sessions or longer play.

Description

Game Introduction

Underswap X Friday Night Funkin’ Vs CrossBones Arcade Game is a fan-made rhythm game that blends the Underswap universe with the core mechanics of Friday Night Funkin’. In this mod, players face off against CrossBones, a skeletal character with a lazy yet heroic demeanor. The game features original music and note charts, offering a fresh challenge for rhythm game enthusiasts. It is available in both story mode and free play mode, providing different ways to enjoy the experience. This open-source project was created by a team including Alex R and Alexim34_2, allowing players to enjoy it freely.

How to Play

To play this rhythm game, use your keyboard arrow keys. When floating arrow symbols appear above the character BF, press the matching arrow keys in time with the music. Your goal is to hit the notes accurately until the song ends. In both story mode and free play mode, you win by reaching the end of each song without missing too many notes. Missing too many in a row results in a loss, requiring a restart. Practice your timing and accuracy to master the charts and succeed in the rhythmic battle against CrossBones.

Game Features

This game offers a skeletal rhythm showdown with catchy original music. It includes story mode and free play mode for varied gameplay. The original music charts are designed by the mod team, providing a unique challenge. The game is open-source and free to play, with simple keyboard controls for easy access. Players can enjoy a fresh take on rhythm battles with unique characters and songs.

Tips for Success

Focus on hitting notes in sync with the beat to maintain your combo. Practice regularly to improve your timing and accuracy, especially on more complex charts. Start with easier songs to build confidence before tackling harder ones. Pay attention to the rhythm and try to anticipate note patterns. If you miss a note, stay calm and continue to avoid losing your streak. Consistent practice is key to mastering the game and enjoying the full experience.

Compatibility

💻 Desktop | 📱 Mobile | 📟 Tablet

– All supported · Best with Chrome or Safari

FAQ

Is this game officially affiliated with Friday Night Funkin’?

No, this is a fan-made mod created by independent developers. It is not officially affiliated with the original Friday Night Funkin’ game or its creators. It uses the same gameplay style but features original content and characters from the Underswap universe.

Can I play this game on mobile devices?

The game is primarily designed for PC with keyboard controls. While some fan-made mods may be adapted for mobile, this version likely requires a keyboard to play. Check the game's official page for any mobile versions or alternatives.

Do I need to download anything to play?

As an open-source game, you may need to download the files from a trusted source like GitHub or a modding community. Some versions may be playable directly in a browser, but typically you will need to download and run the game on your computer.

Are there any other characters besides BF and CrossBones?

Based on the game name and description, the main opponent is CrossBones. The player controls BF, the standard protagonist from Friday Night Funkin’. Other characters may appear in story mode, but they are not explicitly mentioned in the available information.

How long does it take to complete the game?

The game includes both story mode and free play mode. Story mode may have several songs, each lasting a few minutes. Completion time depends on your skill level and how quickly you can master the charts. Free play mode allows unlimited replay of unlocked songs.

Is there any way to adjust the difficulty?

The game description does not mention adjustable difficulty settings. However, many rhythm games of this type include different difficulty levels for each song, such as Easy, Normal, and Hard. Check the game's settings or song selection screen for options.