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You are Boyfriend, a blue-haired kid with a microphone, and you want to date Girlfriend. Her father, a former rock star demon called Daddy Dearest, objects, and the only way past him and everyone he sends is to win rap battles. The mechanic is a four-lane note highway. The opponent sings a phrase, arrows scroll up their side, and then the same pattern arrives on yours and you press left, down, up and right in time as each arrow reaches the receptor. Every hit pushes a shared health bar in your favour; every miss drags it back. Long notes must be held, and each song ends when the track does, with a rating based on how many arrows you nailed.
The content is organised into weeks of three songs. A tutorial with Girlfriend leads into Week 1 against Daddy Dearest, Week 2 against Skid and Pump from the Spooky Month cartoons, Week 3 against Pico, the gun-toting star of Tom Fulp's 1999 Newgrounds game, Week 4 against Mommy Mearest on top of a limousine, Week 5 with both parents at a Christmas mall before a monster interrupts, and Week 6 against Senpai inside a pixel-art dating sim that turns hostile. Week 7 arrived on 18 April 2021 as a Newgrounds exclusive and pits you against Tankman, JohnnyUtah's foul-mouthed Newgrounds mascot, on a battlefield with the three hardest songs in the base game. Story mode runs each week in order on easy, normal or hard; freeplay lets you pick any unlocked song.
What made it stick is that everything in it is a love letter to Newgrounds. The opponents are twenty years of site history, the art has the thick-lined Flash cartoon look of the early 2000s and Kawai Sprite's tracks, from Bopeebo to Ugh, are catchy enough to chart on streaming services. The open code turned players into developers: mods such as Whitty, Tricky, Hex and Sarvente added new weeks with original songs, and the community's charts are often harder than anything the base game asks. A Kickstarter in April 2021 raised over two million dollars for a full version with new weeks and a mod system.
It suits anyone who likes rhythm games without the price tag, and anyone who came to it through mods and wants to see where the characters started. The base game is not long, roughly an hour of story on normal, but hard difficulty on Weeks 6 and 7 is a real skill wall, with dense arrow patterns and fast tempo changes that punish reading late.
On LemonArcade it is free in the browser with no download or account. It is a keyboard game at heart, using the arrows or WASD, and it plays best on a desktop or a Chromebook with physical keys; touch input does not map well to four simultaneous lanes. A song lasts two to three minutes, and if you find the arrows arriving late relative to the music, it is usually the device rather than you, so try a smaller window or fewer open tabs.