In the Sonic FNF HD MOD, Sonic issued a thrilling challenge to Boyfriend (BF) for an exhilarating race and musical duel in the serene Green Hills. The backdrop featured the energetic track 'Racing,' where Sonic initially harmonized beautifully with BF for the first 27 seconds. However, the excitement escalated when Sonic transformed into Super Sonic, his legendary form powered by the seven Chaos Emeralds. He showcased impressive moves and poses while singing alongside BF, who astonishingly kept pace with Sonic, a feat never achieved before, as Sonic was famously known as 'the fastest thing alive.' Both competitors, undeterred and determined to outshine each other in a friendly manner, pushed their limits. BF even tapped into the power of the Chaos Emeralds, evolving into Super Boyfriend (Super BF). Together, they delivered a captivating performance for the final 43 seconds, culminating with BF's stunning conclusion of the song, marked by a long, beautiful note.