Friday Night Funkin at fnf.gosprunki.net is an unofficial rhythm game version created by user toby. Full credits go to ninjamuffin99 (original creator on itch.io) and Kawaisprite for the iconic soundtrack.
This build includes weeks 1 through 6 plus two bonus weeks. However, not every track from those weeks is present – and the creator has confirmed they never will be added. The game was originally built as a test for an arrow‑based rhythm engine, so development has stopped and no further updates will come.
The creator admits the game is "a bit broken" but still playable. Experience this atrocious yet fun version of FNF online free now.