Show HN: An open-source rhythm dungeon crawler in 16 x 9 pixels

#1

Post by jgalecki » Fri, Jun 06, 2025, 10:20 AM UTC

I just released my latest Godot project, a rhythm-based dungeon crawler a la Crypt of the Necrodancer. The entire game plays out in 16 x 9 pixels because of a dare from my game dev group. I've open-sourced (MIT) the code and project files. Of course, the music files I don't own aren't included in the Github project, but I'm releasing the game's hand-crafted pixel sprites under CC0. The Github page also talks about some of the tricks you need to make the rhythm part of the game play nice with the dungeon crawling part.

Show HN: An open-source rhythm dungeon crawler in 16 x 9 pixels
github.com

Re: Show HN: An open-source rhythm dungeon crawler in 16 x 9 pixels

#2

Post by 90s_dev » Tue, Jun 10, 2025, 1:07 AM UTC

> the Tiny Mass Games project, a loose collective of game devs focused on creating polished short-form games in two-month dev cycles

What software is most often used by these persons? I assume pico8?

Re: Show HN: An open-source rhythm dungeon crawler in 16 x 9 pixels

#3

Post by jasonjmcghee » Tue, Jun 10, 2025, 1:08 AM UTC

Very creative - the size means you could do all kinds of creative things with it- reminds me of "snake in favicon" and making games in a font with harfbuzz etc

Re: Show HN: An open-source rhythm dungeon crawler in 16 x 9 pixels

#4

Post by ja2 » Tue, Jun 10, 2025, 1:36 AM UTC

I hope you'll submit a presentation for Roguelike Celebration 2025. Call for presenters ends on June 30th. I know you don't claim the work to be rogue-ish, but it is, and would fit the conference perfectly.

Re: Show HN: An open-source rhythm dungeon crawler in 16 x 9 pixels

#5

Post by sleepybrett » Tue, Jun 10, 2025, 2:10 AM UTC

crypt of the necrodancer

Re: Show HN: An open-source rhythm dungeon crawler in 16 x 9 pixels

#6

Post by zeta0134 » Tue, Jun 10, 2025, 4:20 AM UTC

Yes, fellow rhythm-based dungeon crawlers unite! This looks great fun, the tiny resolution is such a fun artistic constraint.

I love the way you describe the time travel aspect. My own project has to run on an NES, and memory constraints mean I can't actually store a previous game state entirely, so there are endless hacks and cheats to "rewrite history" after resolving most of the enemies in advance, to account for the player's actions at the last moment before display.

I can't cheat the beat timing though (drawing is way too slow) so I've got the beat judgement tuned to look less awful while being reasonably forgiving about late inputs. To compensate, I stretch out the animation timing on the following beat, so the early cels aren't weirdly bunched up after late inputs. It works well enough given the constraints.

It's fun seeing all the different approaches to this problem in the rhythm game sphere! It's way more complicated than you'd initially think, and games have all sorts of tricks up there sleeve to deal with it.

Re: Show HN: An open-source rhythm dungeon crawler in 16 x 9 pixels

#7

Post by nwatson » Tue, Jun 10, 2025, 6:21 AM UTC

For low "pixel count" games try electronic football, 3x9 pixels. From Mattel, 1977.

https://youtube.com/shorts/MNm4e5MxqFk?si=-UR3HayZOuDuhGJm

Re: Show HN: An open-source rhythm dungeon crawler in 16 x 9 pixels

#8

Post by StanislavPetrov » Tue, Jun 10, 2025, 9:16 AM UTC

nwatson wrote: post #7

For low "pixel count" games try electronic football, 3x9 pixels. From Mattel, 1977. https://youtube.com/shorts/MNm4e5MxqFk?si=-UR3HayZOuDuhGJm

I spent an inordinate amount of time on playing this as a little kid.

Re: Show HN: An open-source rhythm dungeon crawler in 16 x 9 pixels

#9

Post by friendzis » Tue, Jun 10, 2025, 9:32 AM UTC

nwatson wrote: post #7

For low "pixel count" games try electronic football, 3x9 pixels. From Mattel, 1977. https://youtube.com/shorts/MNm4e5MxqFk?si=-UR3HayZOuDuhGJm

Please refrain from spreading AI slop

Re: Show HN: An open-source rhythm dungeon crawler in 16 x 9 pixels

#10

Post by jgalecki » Tue, Jun 10, 2025, 10:14 AM UTC

zeta0134 wrote: post #6

Yes, fellow rhythm-based dungeon crawlers unite! This looks great fun, the tiny resolution is such a fun artistic constraint. I love the way you describe the time travel aspect. My own project has to run on an NES, and memory constraints mean I can't actually store a previous game state entirely, so there are endless hacks and cheats to "rewrite history" after resolving most of the enemies in advance, to account for…

Love the 'old console' dev scenes - the ways people deal with the hardware constraints are always so interesting. Making a rhythm game there sounds like a tricky problem. I'm not sure what audio demons you had to exorcise to get it working, but I hope it was more fun than frustrating. I think Crypt of the Necrodancer also lerps enemy animations after post-beat player input, but that wasn't an option for my tiny resolution.

For more fun takes on rhythm games, check out this Roguelike Celebration talk from last year - some people in the Necrodancer community got together and added synchronous networked multiplayer (!!!) to the game. Black magic, haha, and it was a great reference when I was starting this project up.

https://www.youtube.com/watch?v=zwhNSbFVKQM