Friday Night Funkin overview.

Friday Night Funkin, often abbreviated as FNF, is a rhythm game under the donationware model. The game was developed by a team of four Newgrounds users, Cameron “Ninjamuffin99” Taylor, David “PhantomArcade” Brown, Isaac “kawaisprite” Garcia and evilsk8r.
The game revolves around the player character, “Boyfriend”, who must defeat a series of characters in singing and rapping competitions in order to go on a date with his lover.

Instructions about the Friday Night Funkin game:

During play, the opponent will sing a series of notes.
which the player then has to follow using the arrow keys or the W, A, S and D keys, or can customize the way they want. Some songs have more complex tunes, with the player’s melody sometimes being different from the opponent’s.

For each week, players in friday night funkin can choose one of three difficulty levels: Easy, Normal or Hard. As the difficulty increases, the speed of the incoming arrows increases and the order of the arrows becomes more complicated. The player’s high score for each week on each difficulty is tracked and displayed in the top corner of the week selection screen.