FNF Vs. Sans: Last Determined

Rhythm Battles in the Underground

FNF Vs. Sans: Last Determined is a rhythm mod that mixes Friday Night Funkin’ gameplay with the world of Undertale. Boyfriend suddenly finds himself in a strange mountain area, and before long, he is already deep in the Underground. Sans is there, and instead of a normal meeting, everything turns into a chain of music battles that keep pushing the pace.

The experience unfolds across several songs, each one stepping things up a little. At first, the patterns seem manageable, but they do not stay that way. As the tempo picks up, timing becomes tighter, and recovering from mistakes gets harder, so the later sections feel much heavier.

Featured Songs

• Start of a Tale
• LOVE V3
• The Finale

Mod Highlights

The mod leans heavily into the Undertale setting, both in how it looks and how it feels during play. Character visuals, animations, and music all work together to create a more focused atmosphere rather than just a standard FNF track list. The difficulty builds gradually across multiple battles, so each song feels like a step forward instead of a repeat.

How to Play

• Arrow keys or WASD to hit notes
• Enter to pause or confirm

Why Players Love It

A lot of what makes this mod work comes from how close it stays to the Undertale atmosphere while still keeping the familiar rhythm gameplay. The music stands out more as the pace increases, and the pressure builds naturally over time. Even now, there are already some memorable moments, and future updates are expected to add more songs and new encounters.

Related Games

• FNF Sonic Jam
• FNF Reimu: Funkin’ Incident
• Friday Night Funkin’ Corruption

ARCADEMUSICrhythmfnf gamessanspixel