koneko / 4koneko

A browser 4 key vertical scrolling rhythm game.

4koneko

A simple vertical scrolling rhythm game written in JavaScript, available in the browser with many songs to play.

Play it!

Features

• 4K (4 keys) gameplay
• Many songs randomly added
• Customizable keybinds
• Customizable offset and speed
• Custom files support (No long notes, intended by design)
• Easy to modify game files
• Source code available
• No ads, no tracking, no bullshit
• No download required, available in the browser
• Sadly not mobile friendly 😢
• No sound effects (yet)
• Simple scoring system

How to play

• Press the keys when the notes reach the judgement line (the hollow circles at the bottom)
• Play with the keyboard or properly configured controller
• Open settings with Esc
• Press F11 to toggle fullscreen
• Press F12 to open the developer console (goodies in about menu!)
• Play along to fun music

Credits

• koneko for developing the entirety of the game
• quaver for the idea of making it + already existing songs
• dcarapic for helping with the code / logic

License

There is no license, however if you modify the code and ask for help, you will be ignored.

4koneko's Issues

more notes in chart but i cant hit them

tried playing a chart but it had a bunch of notes to the right that i couldnt hit and they're counting against me

Screen recording 2023-04-04 10.59.16 AM.webm
the end where i stop hitting anything is me hitting everything else trying to find what the keybinds are for the extra notes

arrow/note spawn time is wrong

hey, I just wanna say that I really like open source stuff like this. Really helped me out with something I wanted to do.

But lets get serious for a moment:
I was looking through your code and I saw that you spawn the arrows at their stored timing point, but this is not correct. The timing point is the point at wich the note needs to be hit.
The point at wich the note should be spawned should be as follows instead:
'Stored timing point' minus 'time it takes for the note to go from the top of the screen into the receptor'

ive made a hacky fix for this, but you might want to make a more permanent solution if you care about it.
I changed the arrow speed to be the global speed everywhere (this makes the speed easier to track) and I added the following code to the updateArrows() if statement in script.js.
note.seconds - ((screenHeight * 0.8)/this.globalSpeed)*17 <= this.ms

17 is deliberately chozen because updateArrows runs (almost) every 17ms and (screenHeight * 0.8) is where the receptors are according to the calculateY function

I can't change my hotkeys.

I try to change my hotkeys because I don't like using DFJK, but it's not working, I try to put another set of keys and I save, and go to a song, but my keys do not work, and it's always DFJK, Is this a bug... Can you guys help me?