Friday Night Funkin VS GLaDOS Week Concept is a free online rhythm game mod available at fnf.gosprunki.net. This unique FNF mashup brings the iconic antagonist from Valve's Portal series into the Friday Night Funkin universe. The mod features official Boyfriend and Girlfriend sprites alongside custom-drawn background and GLaDOS artwork created by the mod maker.
Boyfriend and Girlfriend find themselves mysteriously transported to Aperture Science. GLaDOS confronts them and agrees to a rap battle to test BF's abilities. After losing the first round, GLaDOS gets salty and demands a rematch before the real testing begins. By the third song, GLaDOS is furious and activates her deadly neurotoxin dispensers for a final, brutal showdown.
During the third song "Deadly Neurotoxin," a unique gameplay mechanic activates: the neurotoxin slowly drains your health over time, forcing you to maintain perfect rhythm to survive. Press "next" to view each phase of the battle.