LemonArcade
FNF 2 Player takes Friday Night Funkin', the rhythm game that ninjamuffin99, PhantomArcade, evilsk8r and Kawai Sprite released on Newgrounds in November 2020, and turns its one-sided rap battles into a contest between two people at one keyboard. The original game is open source, which is why builds like this exist: the community took the engine, wired the opponent's note lane to a second set of keys, and gave the second player a real part. This particular build is distributed through GameDistribution and does not credit its author, so it is a fan modification rather than anything from The Funkin' Crew.
The setup is the one every FNF player knows. Two characters face each other, a song plays, and arrows scroll up two lanes toward a strike line. In the base game only Boyfriend's lane belongs to you, and the opponent's notes play themselves. Here player one takes Boyfriend on the arrow keys and player two takes the opponent on WASD, and both lanes are live at the same time. Hitting an arrow on the beat scores, missing drains the health bar toward the other side, and the song ends with whoever held their half better.
There are three ways to play. Story mode runs through weeks of songs against the familiar cast, freeplay lets you pick any track and difficulty on your own, and the 2 Player mode is the reason the build exists. Portal listings for this version count eleven songs across the usual difficulties, drawn from the original weeks, which means Bopeebo, Fresh and Dad Battle, the Spooky Month tracks and Pico's week are the core of what you will be battling over.
What changes when the opponent is a human is the feel of the charts. FNF's early songs were written to be answered, with the opponent singing a phrase and Boyfriend echoing it, so in 2 Player mode the two of you take turns rather than hammering at once, and the pressure lands on whoever has the harder phrase. Long notes have to be held, and a missed hold costs more than a missed tap. Watching your friend flub the Spookeez run while your own lane sits empty is half of the fun.
It suits anyone who already likes FNF and wants a reason to play it on the sofa, and it is a good first rhythm game for two people of uneven skill because the difficulty setting applies to both lanes at once. It is not a substitute for the full game or the big mods; the song list is short and there are no custom characters beyond the original cast.
On LemonArcade it runs free in the browser with no download or account, and on desktop it needs a physical keyboard for two players. On a phone the on-screen arrows work for a single player, but a two-player match on one small screen is not practical. Songs last two to three minutes, and on Hard the later weeks are as demanding as the original.