Andrzej Mazur

Fifteenth edition of #js13k, web game development competition where you have to fit your entire game into a 13 kilobyte zip, starts NOW! The 2026 #theme is... #UNICORNS AND #RAINBOWS! 🦄🌈 js13kgames.com/2026/blog/co... #gamedevjs #gamejam #indiedev #indiegames #codegolf #JavaScript #HTML5

Issue #668 of Gamedev.js Weekly newsletter about SpringTale, LittleJS 1.28, and xFPS is out - go check it! gamedevjsweekly.com/668 #HTML5 #JavaScript #gamedevjs #gamedev #weekly #newsletter

Issue #667 of Gamedev.js Weekly newsletter about chasing the moment, EXPAND, and Mona's Bug Bash is out - go check it! gamedevjsweekly.com/667 #HTML5 #JavaScript #gamedevjs #gamedev #weekly #newsletter

Issue #666 of Gamedev.js Weekly newsletter about Google Playground, js13kGames 2026 winners, and PixiJS AI skills is out - go check it! gamedevjsweekly.com/666 #HTML5 #JavaScript #gamedevjs #gamedev #weekly #newsletter #js13k #Google #PixiJS

Check out part 4 of my #JS13k games compilation video series: youtu.be/_EhauRs6JFA

Here's another part of my #js13k Games compilation: youtu.be/Z0dGW8A_Nv0

Playing through more of the #JS13k games! youtu.be/O4SwU4gjnIw

Finally finished our #JS13K postmortem. Come learn about #WebGPU! github.com/cutout-studi...

Behold, here are the overall WINNERS of the #js13k 2026 competition! 🎉 1. Spectral Horn by Filip Paulů 2. Panzercorn by Chris Subagio 3. HueCorn by Ryan Tyler Post: js13kgames.com/2026/blog/wi... Results: js13kgames.com/2026/#winners Congratulations and thank you all! #gamedev #gamedevjs

Voting for the best #js13k 2026 entries ends soon! Do you have any favourites or guesses who could win? js13kgames.com/2026/games #gamedev #gamedevjs #gamejam #compo #competition #countdown #voting #winners #JavaScript #HTML5

I made a game for js13kGames this year, and published a blog post about the making of it: nallebeorn.se/blog/js13k20... #js13k #gamedev 🦄🌈

every SP13KTRA skybox, stacked 🌈 all eight panoramic skies are now baked into textures for the Dreamcast port. It draws faster and looks better too! 👍 #dreamcast #homebrew #js13k

SP13KTRA for Dreamcast v1.12 🌈🚀 big push for 60 fps on real hardware. way fewer verts, baked skybox, DMA to the PowerVR, plus VMU screen support! thanks to everyone who tried it on hardware 🙏 free download 👇 github.com/KilledByAPix... #Dreamcast #homebrew #js13k

My JS13K game SP13KTRA is now available on Dreamcast! 💿 All 8 tracks, 60 fps, VMU saves, full soundtrack. More about how I did it in this thread. 🧵 #dreamcast #homebrew #js13k #claude

What happens if you put Tempest on the beat, add a unicorn and rainbows, then squeeze it all into 13KB? UNxR. Ta-da! 🦄🌈 #ScreenshotSaturday #js13k

Issue #665 of Gamedev.js Weekly newsletter about Halo in the browser, LittleJS Jam 3, and Defold 1.13.2 is out - go check it! gamedevjsweekly.com/665 #HTML5 #JavaScript #gamedevjs #gamedev #weekly #newsletter

Our fourth #js13k Community Soundtrack is up on Bandcamp already, thanks to João Lopes yet again. You can listen to some great music from this year’s games, and add yours to the album too. js13kgames.com/2026/blog/co... #gamedev #gamedevjs #soundtrack #music #sounds

Issue #664 of Gamedev.js Weekly newsletter about 10M gameplays, 3D Gaussian Splatting, and Robot Rivals is out - go check it! gamedevjsweekly.com/664 #HTML5 #JavaScript #gamedevjs #gamedev #weekly #newsletter

Got some of my JS13k Games Coverage: #gamejam #js13k youtu.be/nN41Fv3gkj4

Next game to re view in #js13k is "BLADE:13 - PRISM BREAK" js13kgames.com/2026/games/b...

Since 2021, #js13k has grown into five games, each within 13 KB: Space Arcade, Enchanted Dungeon, XIII Floor, Catapoolt and UNxR. Along the way: Miniracers, a 64×64 px PICO-8 racer for #LOWREZJAM. Latest: SUPAPONG - PONG × SUPERHOT in less than 1 KB for #pico1k. So far ↓

We learned during #JS13K that debugging game loops is an absolute pain: so we've proposed a change to the #WHATWG console to make it a little bit better. The `%t` token: github.com/whatwg/conso...

Here’s a 64×64 PICO-8 demake of the UNxR logo reveal animation from my #js13k 2026 entry. Source code: just 292 chars 👇 www.lexaloffle.com/bbs/?tid=159... Play UNxR & vote for it: js13kgames.com/2026/games/u... #pico8 #postcart #gamedev #pixelart #demake #indiedev

People ask what UNxR means. It’s pronounced “UNKser”: UN and R are the first letters of this year’s #js13k theme. R also stands for Rhythm, the core mechanic; x marks the crossover with Tempest-style gameplay. And if you dig a bit deeper, the whole name is a subtle nod to TxK.

i wrote a short blog post about my js13k games. working on a longer one that explains more technical details about how i made sp13ktra. frankforce.com/i-made-4-gam... #js13k

here's a top down view of all 8 tracks in SP13KTRA 🌈 every track is built procedurally, the full 3D road with banked turns, hills and crossovers, and all the scenery. each one has its own theme, palette, and building shapes. and the whole game fits in 13 kilobytes! #js13k

I would appreciate feedback for this one to make the director's cut better. If you have a github account and you enjoy playing it please leave a feedback. #js #gamedev #webgl #js13k #game #minigame

full soundtrack for my 13k game SP13KTRA is up on soundcloud soundcloud.com/user-2986066... the mp3 is about 400x bigger then the game itself! 🤔 #js13k

Check out Unicorn Dream, my entry for @js13kGames 2026! #js13k #gamedev #js js13kgames.com/2026/games/u...

Meet UNxR 🦄🌈 - my @js13kGames 2026 “Unicorns & Rainbows” entry. 13KB. 99 levels. 16 arenas. 5 enemy types, each with unique behavior - Tempest × rhythm game crossover. Miss the beat, lose your turn! Play & vote 👇 js13kgames.com/2026/games/u... #js13k #gamedev #indiedev #indiegame

My new game SP13KTRA is out! 🌈 8 racers, 8 tracks, 8 songs, real 3D, and it all fits in 13K. Play in your browser on desktop or phone: mouse, keyboard, gamepad or touch. @newgrounds.com @wavedash.com @itch.io @github.com #js13k #gamedev

here's the magic trick behind how I fit 8 music tracks in my #js13k game SP13KTRA. 🌈🚀 every song is defined by a single number. 😯 the random generator uses 26 dice rolls per track for its parameters. i used AI to make this music bench to find a good seed to fit each level.

SP13KTRA 🟥🟧🟨🟩🟦🟪 #js13k www.dwitter.net/d/36289 with(x)for(i=c.width|=c.style.filter='invert(',textAlign='center',globalCompositeOperation='xor',font='85em impact';i--;fillText('KTRASP13'[i%8],(i-3-t)*500,1080))fillStyle=`hsl(${i*45},99%,50%`

Very proud to announce you can now rate our game on the #JS13K website - js13kgames.com/2026/games/m... Play and rate some of the other entries while you're there. Everything is very impressive.

My entry for this year's #JS13K This year I made a children's book where the levels are the book's chapters, and you play through the story of a rhinoceros that shoots a rainbow out of its butt. js13kgames.com/2026/games/r... #gamedev

Just about managed to finish sth for #js13k Fun times! #gamedev #littlejs 🦄 Play it here: js13kgames.com/2026/games/g...

Spotted Cathy de Monchaux’s famous Unicorn at Palais de Tokyo in Paris 🦄 Meanwhile, I was there making my game UNxR for the #js13k contest with a very similar theme: “Unicorns and Rainbows.” 🌈 js13kgames.com/2026/games/u... Check it out!

My new game SP13KTRA is an anti-gravity racer inspired by F-Zero and Wipeout! 🏎️🌈 The whole game fits in just 13 kilobytes, including the art, music, engine, and rendering. 👀 Play it right in your browser! #js13k #gamedev js13kgames.com/2026/games/s...

Finished my first JS13k entry this year with Queenie's Playland js13kgames.com/2026/games/q... While the game ended up much simpler than planned, it really was a blast! #picoCAD2 #js13k

This year JS13K submission is here: js13kgames.com/2026/games/r... #js13k #game #unicorn #rainbow

I was expecting MORE games featuring rhinoceroses — after all, the theme of the year was "Unicorns and Rainbows," and they are essentially **real-life battle unicorns**. But so far, I haven't spotted another game with this animal. I wonder if @end3r.bsky.social feels the same...

This year JS13K had 317 entries, smashing the previous record! Congrats to @end3r.bsky.social and everyone who submitted. 🎉 It was also the biggest year yet for ZzFX, with 65 entries using it, 51 using ZzFXM, and 8 games made with LittleJS Engine. 😄👍 #js13k

Issue #663 of Gamedev.js Weekly newsletter about MTLX, ArmorPaint, and fractal tunnel is out - go check it! gamedevjsweekly.com/663 #HTML5 #JavaScript #gamedevjs #gamedev #weekly #newsletter

Now that we accepted all 317 #js13k 2026 entries, it's time to VOTE and pick the best games this year! 🎉 js13kgames.com/2026/blog/vo... Have fun! 🦄🌈 #gamedevjs #gamedev #gamejam #indiedev #indiegames #codegolf #JavaScript #HTML5

Issue #662 of Gamedev.js Weekly newsletter about seven terabytes of terrain, 300+ js13kGames entries, and Opusfived is out - go check it! gamedevjsweekly.com/662 #HTML5 #JavaScript #gamedevjs #gamedev #weekly #newsletter #js13k

We've received more than 300 #js13k entries this year, which is a record since the very beginning in 2012! js13kgames.com/2026/games We're still helping fix some issues with submissions, and the voting will begin tomorrow, as planned! #gamedevjs #gamedev #gamejam #indiedev #indiegames #codegolf

Submitted my #js13k game at the last minute. My niece like it, so thas's already a win for me. js13kgames.com/2026/games/u... #gamedev #javascript

Just submitted my JS13k game Rainbow Ricochet. https://js13kgames.com/2026/games/rainbow-ricochet #js13k #gamedev

It has now been submitted. Learnt a lot doing this. I've been making online games for 20 something years, but this is the first time I've worked within strict guidelines. It's been fun, and challenging! #js13k #gamedev #javascript js13kgames.com/games/unicor...

one last push on SP13KTRA! 🏎️🌈 anti-gravity racing inspired by F-Zero and Wipeout, all in 13 kilobytes. i'm still tweaking the racing and could really use some playtesters. gameplay below, play link in the next post! #js13k #gamedev

Go play my #js13k gamejam game! #gamedev #indiegame labrat.mobi/games/hornbo...