Friday Night Funkin Boyfriend & Sonic Duet - Phantasm Song FNF MOD-Hard playable is a free online rhythm game mod at fnf.gosprunki.net. This hard-difficulty mod features Boyfriend and Sonic teaming up against Corrupted BF and Fleetway Sonic.
Credits: @fireninja234 (BF & Corrupted BF), @corvinatis (Fleetway Sonic and backgrounds), Gamemode6630 (cover and music), @SquigglyTuff (static). You may remix this mod as long as you give credit. A ❤ and a ⭐ are greatly appreciated – the creator spent forever coding and adjusting the original sprite code.