Js13kGames is a JavaScript coding competition for HTML5 Game Developers . The fun part of the compo is the file size limit set to 13 kilobytes . The competition started at 13:00 CEST, 13th August and ended at 13:00 CEST, 13th September 2020 . Theme for this year was 404 . Read GitHub's tips and tricks article, check the Resources for tools, read the Blog , and subscribe to the Newsletter - good luck and have fun !

I'm running this competition on my own in my free time. I usually acquire prizes worth more than 20.000 USD and send special js13kGames t-shirts to top participants for free . With gadgets and stickers, every single year, with free shipping . To help me keep it all going you can send a few bucks via the PayPal button below, thank you !

Share the love for HTML5 games and support the js13kGames competition! See the Contact section for more details on how to get in touch.

Michelle is a Content Producer in the realms of innovation and technology. Known as the “Hackathon Queen” 👑 you'll often find her on stage MC’ing or speaking on a range of topics from artificial intelligence, to business, community engagement, the future of work, and esports. With a background in both science and arts, Michelle has a passion for gaming and combines this with her experience in a range of industries. Michelle brings a unique insight into gaming and is a gaming journalist and Twitch Streamer too!

Graphic Designer , mom and wife. Open source and mobile games enthusiast. Making game designs for Enclave Games , t-shirt designs for js13kGames , writing inspirational posts and tutorials on Tutsy and making cool things for children at MAMAdesigner . Loves taking photos , drawing icons , and spending time with her family.

Founder of Quantum Flytrap - a quantum lab right in your browser. A deep learning specialist with a Ph.D. in quantum physics (from ICFO, Castelldefels). Piotr works on AI for content design and physics engine optimization in ECC Games, and develops Quantum Game with Photons - an open-source in-browser game with real quantum mechanics. He has a passion for interactive data visualizations, explorable explanations. Piotr blogs about data science, programming, quantum physics, games, and... dating.

Yuriy is a founder of Puma Browser – mobile browser focused on seamless payments and data privacy. Previously worked at Lyft, Facebook, Meteor, Cloudant and a few startups as Developer Advocate ⁄ Engineer. Grew up in 🇺🇦🇯🇵🇨🇦. Lives in SF now, enjoys tennis, moto rides, park walks and games.

Partner Engineer at Facebook since 2017, working mainly on the Instant Games platform. I am a movie and video game addict, secretly dreaming of becoming a movie director. I joined and co-organized quite a few game jams (Global Game Jam in Singapore in 2018, 2019 and 2020, etc.). I am always excited to see how talented developers manage to make gems from constraints.

Nathan is a Software Engineer at Coil who considers himself a gamer first and an engineer second. He's been working with and on applications using Web Monetization for the past year, and is eager to see the intersections between Web Monetization and game design this year!

A game-AI researcher that is interested in automated game design and procedural content generation and a game designer ⁄ developer since 2005 creating more than 40 games on various platforms.

Maciej Szpyra, Paweł Skierczyński and Victor Debone. Developers during the day, gamers during the night. At Spartez , our personal passion for games is big enough that we bring a team to the jury. We are ready to play the games coming from 2020 developers 🕹🕹🕹

Joep leads the creator team at Poki , the number #1 platform for play on web. Poki' on a mission to create the ultimate online playground: a place where kids of all ages and game developers come together to play and create. Reaching more than 30M monthly active users worldwide Poki is market leader on web. They help a growing 300+ game developer community - including Kiloo (Subway Surfers), Hipster Whale (Crossy Road) and Colin Lane (Dunkers) to achieve success on web. Here's more information about how creators can get their html5 games featured on Poki.

Certified game developer and Founder of ZENVA - the world's leading platform to learn game making, VR, data science and full-stack programming. Since 2012, Pablo has been developing professional-grade courses that have helped over 500,000 learn to code and make games.

For over 20 years Josh Marinacci has worked as developer advocate, UX designer, researcher, engineer, and Twitch streamer . He has worked at such storied companies as Palm, HP, Nokia, Sun, and Mozilla. Formerly of Mozilla Mixed Reality team, currently looking for new XR related employment. Josh believes in the power of technology thoughtfully applied, and the need for better human computer interfaces.

Tom Greenaway is the gaming lead for Chrome and Web Developer Relations at Google. He's also a multi-award winning game designer having created Duet for Android and iOS which was downloaded nearly 20 million times worldwide.

Dann is the Editor of Pocket Gamer, Managing Editor for 148Apps and AppSpy, as well as the founder & Editor in Chief of Big Boss Battle (B3). He believes that curation and feedback can create a better, more fluid industry.

Product Owner and Board Member of the Defold Foundation, overseeing development of the free and source available Defold game engine . Worked with mobile game development since before the smart phones. Loves old school games and roguelike games (hosts the Rogue Basin wiki ). Strong believer in the power of open source development with more than 150 open source projects on GitHub .

YouTuber & writer of Indie Games, lover of Game Jams, Co-host of IndieGameJams.com . Aiming to be the Queen of Indie Games. Also enjoys going outside from time to time and taking pictures.

There are five different categories , you can submit your game to any of them - it's up to you. There are special pages for Web Monetization and WebXR categories if you want to know more.

The first three categories (Desktop, Mobile, and Server) are voted by participants themselves separately, while WebXR and Web Monetization results will be judged by the experts.

Rules

Package size below 13 kB All your code and game assets should be smaller than or equal to 13 kilobytes (that's exactly 13,312 bytes, because of 13 x 1024) when zipped. Your .zip package should contain index.html file in the top level folder structure (not a subfolder) and when unzipped should work in the browser. Don't overcomplicate building the zip package, it should unpack on any platform without problems. You can use tools that minify JavaScript source code.

Two sources - readable and compressed The competition is focusing on the package size, but learning from others is also very important. Please provide two sources of your game - first one should be minified and zipped to fit in the 13 kB limit (sent via the form) and the second one should be in a readable form with descriptive variable names and comments (hosted on GitHub).

No external libraries or services You can't use any libraries, images or data files hosted on server or services that provide any type of data - for example Google Fonts are not permitted (although you are allowed to ask users to live-load a web font to support some characters or emoji on devices that can't display them properly, but you have to make sure your game will work without them). Analytics and other stat-collecting scripts are also not allowed. All the game assets should fit in the package size limit (the A-Frame, Babylon.js, and Three.js frameworks are not counted towards the size limit, but you can use them only in the WebXR category). If you manage to shrink your favorite library below 13 kilobytes including the code itself, then you can use whatever you want, just remember about the 13 kB limit.

Main theme Main theme for the competition is announced on August 13th. It's highly advised to follow it in your game, because the judges will pay attention to that, but you can freely interpret the theme and implement it however you feel would be the best.

Deadline - 13th September 2020 The competition starts at 13:00 CEST, 13th August 2020 and ends at 13:00 CEST, 13th September 2020. No submissions will be accepted after the end of the competition, although there may be exceptions to that.

Licensing You have to have the rights for every asset used in your game. Remember that the submitted games will be published and made available for everybody to see. On the other hand, you have the right to report any game publisher that will link to (or iframe) your entry on their portal without your permission.

New content only Do not submit any old games or demos - you have a whole month to work on something new and fresh, this should be more than enough. Also, submitting Breakout or Flappy Bird clones taken out of a tutorial make no sense at all - try creating something at least a little bit more original. You can, however, use any available libraries and resources that are not yours, but you have the right to use them.

Errors and browser support Your game must work and be playable in at least two browsers: latest Firefox and Chrome, but the more supported browsers, the better. There should be no errors - you can lose some points if your game is showing any errors in the console. If we cannot play your game, it won't be accepted.

Teams It doesn't matter if you're working alone or with your friends, just remember that the number of prizes is fixed, so you'll have to share your trophies with your teammates.

Sending submissions There's a special form to submit your game. Please remember that you have to provide two sources (see the Rule #2 for details) - a link to a public repository on Github and a zipped package. Participants are allowed to submit more than one game in the competition, though sending the same game as independent submissions targeting different platforms (for example separate builds for desktop and mobile) is forbidden.

Accepting submissions Submissions will be checked manually and published after positive verification. This may take up to a couple of days, so be patient if your game is not yet online. I claim the right to reject any submission without giving a reason, although I hope I don't have to. I also have the right to update the rules of the competition at any time.

Time frames for voting, giving feedback, and announcing winners The voting among the participants will last for three weeks between September 14th and October 4th, winners will be announced on October 5th. Experts will give the games constructive feedback (one per game) during the same three week period - their comments will also be published on October 5th.

Save data ⁄ persistent memory Remember to add prefix to your variables and create a namespace for your game when you save data to localStorage as all the games on the server share the same memory when played in the browser. Also, be sure to NOT use localStorage.clear() as it will wipe out all the data of all the other games. Manipulate the data you are sure is yours.

Server category specific rules All the Server category rules, the sandbox server and the demo code can be found at github.com/js13kGames/js13kserver.

Code of conduct All participants and judges at js13kGames are required to agree with the following code of conduct. Organizers will enforce this code throughout the online event. We are expecting cooperation from all participants to help ensuring a safe environment for everybody. Js13kGames is dedicated to providing a harassment-free competition experience for everyone, regardless of gender, sexual orientation, disability, physical appearance, body size, race, or religion. We do not tolerate harassment of competition participants in any form. Competition participants violating these rules may be sanctioned or expelled from the competition at the discretion of the competition organizers. TL;DR: Be excellent to each other. For more details see Berlin Code of Conduct.

Copyright ownership The following terms apply to participation in this competition ("Competition"). Entrants may create original solutions, prototypes, datasets, scripts, or other content, materials, discoveries or inventions (a “Submission”). The Competition is organized by the Competition Organizer. Entrants retain ownership of all intellectual and industrial property rights (including moral rights) in and to Submissions. As a condition of submission, Entrant grants the Competition Organizer, its subsidiaries, agents and partner companies, a perpetual, irrevocable, worldwide, royalty-free, and non-exclusive license to use, reproduce, adapt, modify, publish, distribute, publicly perform, create a derivative work from, and publicly display the Submission. Entrants provide submissions on an "as is" basis, without warranties or conditions of any kind, either express or implied, including, without limitation, any warranties or conditions of title, non-infringement, merchantability, or fitness for a particular purpose.

Privacy policy By entering your email address and sending a game through the submit form you agree to receive email communication about important events of the competition like announcing the winners or sending out the digital prizes, but also curated content from the partners about their tools, services, or job offers. I will never share your email with anyone though.