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Andrzej Mazur

@end3r.bsky.social
1.7K followers 80 following 471 posts

Web Game Developer, Enclave Games studio founder, js13kGames compo creator, Gamedev.js starter, Gamedev.js Weekly newsletter publisher, W3C Games chair, GitHub Star, OP Guild head.

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Andrzej Mazur @end3r.bsky.social · 25/09/2026
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
js13kGames 2026 Community Soundtrack
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Andrzej Mazur @end3r.bsky.social · 25/09/2026
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
gamedevjsweekly.com
10M gameplays, 3D Gaussian Splatting, and Robot Rivals
Check out issue #664 of Gamedev.js Weekly — the free, weekly newsletter about web game development.
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Jupiter @jupiterhadley.com · 24/09/2026
Got some of my JS13k Games Coverage: #gamejam #js13k youtu.be/nN41Fv3gkj4
youtu.be
Jupi Plays Indie Games: ALL THE GAMES [JS13k Games 2026] [Part 1]
YouTube video by Jupiter_Hadley
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Victor @javascripl.bsky.social · 23/09/2026
Next game to re view in #js13k is "BLADE:13 - PRISM BREAK" js13kgames.com/2026/games/b...
js13kgames.com
BLADE:13 - PRISM BREAK
A game in the js13kGames 2026 competition. Play it now, for free!
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Gleb Volkov @glebv.bsky.social · 21/09/2026
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 ↓
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Cutout @cutoutstudios.com · 20/09/2026
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...
github.com
Proposal: `%t` topic/tag/tab token · Issue #255 · whatwg/console
What problem are you trying to solve? I just finished participating in js13kgames.com and lemme tell you, debugging game loops are a pain, mainly because you cannot reasonably work with 10,000 logs...
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Gleb Volkov @glebv.bsky.social · 19/09/2026
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
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Gleb Volkov @glebv.bsky.social · 18/09/2026
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.
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Frank Force @frankforce.bsky.social · 18/09/2026
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
frankforce.com
I made 4 games for JS13K 2026
Four Games in 13 Kilobytes I’ve been participating in JS13K since 2019 and this year I wanted to take it to a new level. So I didn’t make one game, I made four. Each game fits in a 13 K…
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Frank Force @frankforce.bsky.social · 17/09/2026
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
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Hogias @hogia.bsky.social · 16/09/2026
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
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Frank Force @frankforce.bsky.social · 16/09/2026
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
soundcloud.com
SP13KTRA Soundtrack
the soundtrack for SP13KTRA, my anti-gravity racing game for js13k 2026. the whole game fits in 13 kilobytes, including the music. 🌈🚀 every song is generated from a single number. a seeded random g
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Hogias @hogia.bsky.social · 16/09/2026
Check out Unicorn Dream, my entry for @js13kGames 2026! #js13k #gamedev #js js13kgames.com/2026/games/u...
js13kgames.com
Unicorn's Dream
A game in the js13kGames 2026 competition. Play it now, for free!
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Gleb Volkov @glebv.bsky.social · 16/09/2026
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
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Frank Force @frankforce.bsky.social · 16/09/2026
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
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Frank Force @frankforce.bsky.social · 15/09/2026
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.
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Frank Force @frankforce.bsky.social · 14/09/2026
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%`
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Cutout @cutoutstudios.com · 14/09/2026
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.
js13kgames.com
MISSION: DARKWHITE
A game in the js13kGames 2026 competition. Play it now, for free!
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Aurélio Heckert @aurium.bsky.social · 14/09/2026
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
js13kgames.com
Rino Finding Love
A game in the js13kGames 2026 competition. Play it now, for free!
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eoinmcg @eoinmcgrath.com · 14/09/2026
Just about managed to finish sth for #js13k Fun times! #gamedev #littlejs 🦄 Play it here: js13kgames.com/2026/games/g...
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Gleb Volkov @glebv.bsky.social · 14/09/2026
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!
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Frank Force @frankforce.bsky.social · 13/09/2026
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...
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talesfromuranus.bsky.social @talesfromuranus.bsky.social · 13/09/2026
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
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Juhani Ovalo @yabadaba.bsky.social · 13/09/2026
This year JS13K submission is here: js13kgames.com/2026/games/r... #js13k #game #unicorn #rainbow
js13kgames.com
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Aurélio Heckert @aurium.bsky.social · 14/09/2026
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...
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Frank Force @frankforce.bsky.social · 14/09/2026
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
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Andrzej Mazur @end3r.bsky.social · 18/09/2026
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
gamedevjsweekly.com
MTLX, ArmorPaint, and fractal tunnel
Check out issue #663 of Gamedev.js Weekly — the free, weekly newsletter about web game development.
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Andrzej Mazur @end3r.bsky.social · 14/09/2026
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
js13kgames.com
Voting is open!
The fifteenth yearly edition of the js13kGames competition ended with a record-breaking 317 entries! Last year’s amount was 197 games, and the previous record was 274 games in 2018 - that’s the first ...
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Andrzej Mazur @end3r.bsky.social · 13/09/2026
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
gamedevjsweekly.com
Seven terabytes of terrain, 300+ js13kGames entries, and Opusfived
Check out issue #662 of Gamedev.js Weekly — the free, weekly newsletter about web game development.
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Andrzej Mazur @end3r.bsky.social · 13/09/2026
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
all js13kGames 2026 entries
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Wiserim @wiserim.bsky.social · 13/09/2026
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
Screenshot of game submission for js13k 2026 game competition.
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Nicklas Löf @snukey.mastodon.social.ap.brid.gy · 13/09/2026
Just submitted my JS13k game Rainbow Ricochet. js13kgames.com/2026/games/rainbow-r… #js13k #gamedev
A pixelated video game scene featuring a dark, brick environment with a red fog effect. The player's health and bullet count are displayed on the left side. In the background, shadowy figures are visible through a window.
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Ben @binarymoon.bsky.social · 13/09/2026
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...
js13kgames.com
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Frank Force @frankforce.bsky.social · 12/09/2026
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
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Karthik VJ @karthikvj.bsky.social · 12/09/2026
Go play my #js13k gamejam game! #gamedev #indiegame labrat.mobi/games/hornbo...
labrat.mobi
Hornbound
In this roguelike adventure, you play as a Unicorn on a quest to find the missing rainbows. Explore, survive, and collect them all!
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Andrzej Mazur @end3r.bsky.social · 13/09/2026
We have 200 #js13k entries accepted already, ~40 in the queue, ~60 drafts, and still (a bit less than) THREE HOURS to go before the deadline! js13kgames.com/2026/submit #gamedevjs #gamedev #gamejam #indiedev #indiegames #codegolf #deadline #submit #JavaScript #HTML5
js13kGames 2026 ends in 3 hours
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Andrzej Mazur @end3r.bsky.social · 12/09/2026
Less than 24 HOURS left to submit your game into #js13k 2026, if you haven't done that already - we're now at 160 entries, and ~75 drafts! js13kgames.com/submit #gamedevjs #gamedev #gamejam #indiedev #indiegames #codegolf #deadline #submit
js13kGames 2026 ends in less than 24 hours
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Ben @binarymoon.bsky.social · 12/09/2026
Oh. Looks like I updated the URL and didn't add a redirect from the old page. Unicorn Escape is here now: beepmini.com/games/unicor... #js13k
beepmini.com
Unicorn Escape
You are a happy unicorn, but you have fallen down a big hole and find yourself in some caves. So you need to jump around the cave system to regain your rainbow powers so you can escape.
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Frank Force @frankforce.bsky.social · 11/09/2026
My 4th JS13k game this year is coming in hot! 🏎️🏳️‍🌈 #gamedev #js13k
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Morph Games @morph.games · 11/09/2026
I finally completed my #js13k #rocketry game and decided to simultaneously put it up on itch: deathray.itch.io/unicorn-spac... -- free to play on mobile or desktop (preferred). #rockets #ksp #kerbal #gamedev
deathray.itch.io
Unicorn Space Program: Rainbow Rockets 13kb by Morph
Launch rockets powered by rainbows
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Cutout @cutoutstudios.com · 11/09/2026
Day 28... 29? Our draft is live on the #JS13K site!! Please have a look and give us your initial feedback!! js13kgames.com/games/wip-mi...
js13kgames.com
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Frank Force @frankforce.bsky.social · 10/09/2026
I made an Italian language learning game with no English, only emojis! 🍕😻👍🇮🇹 js13kgames.com/games/arcoba... It was made for JS13K, so the entire game fits in just 13 kilobytes. If you’re studying Italian, give it a shot on desktop or mobile and let me know how it goes! #js13k
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Cutout @cutoutstudios.com · 10/09/2026
Days 26-27: coming down to the wire here - we'd avoided using LLMs, but there's no way we're gonna finish in time now. Mostly just to create throwaway editing tools so we don't have to manipulate raw values directly when every hour counts. #JS13K
Audio EditorImage Editor
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Shauna @shauna-l.bsky.social · 08/09/2026
Rainbow Ranch is in the running for js13k competition, webXR category. 12,757 bytes. Play it now, for free, no ads, no sign-ins! Desktop available, but best experienced in VR with hand tracking enabled. js13kgames.com/2026/games/r... #js13k #threejs #webxr #gamedev
js13kgames.com
Rainbow Ranch
A game in the js13kGames 2026 competition. Play it now, for free!
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Frank Force @frankforce.bsky.social · 08/09/2026
Just submitted my second #js13k game: Emoji High School! 😄👍🏫 A dating sim where the only language is emoji. Everyone hides what they love. Send a 🍓 and read the face that comes back. Was it the red, food, or tiny? You have one school year to work out what everyone likes.
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Rémi Vansteelandt @remvst.bsky.social · 09/09/2026
My #js13k post mortem, in which I cover minification, game design, physics, story, music, and more remvst.substack.com/p/how-i-made... #gamedev
remvst.substack.com
How I made a physics-based BMX game in less than 13 kilobytes
Post mortem for my entry for 2026's JS13K. How I fit physics, graphics, story, music, and more into a 13kb zip file.
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Wiserim @wiserim.bsky.social · 09/09/2026
Core game loop is currently finished. I've added some variety to enemies and spawn mechanics. You can also attack enemies. #js13k #gamedev #javascript
Screenshot of game submission for js13k 2026 game competition (work in progress).
It shows 6x6 board for match-3 type game, progress bars for 6 colors and placeholders representing enemies.
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Ben @binarymoon.bsky.social · 10/09/2026
Have put the game online. Please tell me what you think! #gamedev #indiedev #js13k #videogame #javascript beepmini.com/games/unicorn/
beepmini.com
Unicorn Escape
You are a happy unicorn, but you have fallen down a big hole and find yourself in some caves. So you need to jump around the cave system to regain your rainbow powers so you can escape.
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Andrzej Mazur @end3r.bsky.social · 08/09/2026
This year's #js13k t-shirt design and the gadget are finally revealed! js13kgames.com/2026/blog/ts... How do you like them? Let us know! #gamedev #gamedevjs #gamejam #indiedev #indiegames #swag #tshirt #wristband
js13kGames 2026 t-shirt and wristband
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Wiserim @wiserim.bsky.social · 08/09/2026
Added progress bars, win / lose conditions and enemies. I'm experimenting with using #CSS animations as timing functions for #JS and effects are promising. #js13k #gamedev #javascript
Screenshot of game submission for js13k 2026 game competition (work in progress).
It shows 6x6 board for match-3 type game, progress bars for 6 colors and placeholders representing enemies.
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