Battle Sans with the power of music in this exciting crossover between Friday Night Funkin and Undertale. In this game, use arrow keys to press the arrows and push arrow icons to the end of the line. Double-click the green flag to avoid bugs. For now, the game is only keyboard compatible, so make sure you have a keyboard ready before playing. Check out the creator's other project Bonetale in their profile.
The base code is thanks to @Iron_Man_Jarvis_Code. This project is not finished and the creator has planned several updates: changing all songs to Sans-type songs, adding the countdown showing animation, adding miss costumes for Boyfriend, putting Girlfriend on the speaker, and adding more story. The creator might also add playing as Chara or Frisk to fight Sans, fight other Undertale bosses, and include many more features.
Please report any bugs or glitches you find in the comments. The developer is actively working on improvements. Future updates could transform the game into a full Undertale rhythm adventure. If you enjoy Friday Night Funkin and Undertale, this crossover is a must-try. You can also explore other FNF mods like Expurgation or Tricky Mod while waiting for new updates to this game.
Key features currently available: arrow key rhythm battles against Sans, Undertale-themed visuals, and the potential for extensive future content. As the developer continues to refine the experience, expect more Undertale characters, songs, and story elements. Play FNF vs Sans online now and be part of the development journey.