What is js13kGames?
Read Tuts+ Gamedev intro article, my blog post and see the Rules for details, good luck and have fun!
Hi, I'm Andrzej
I'm running this competition on my own
in my free time. I acquired prizes worth more than 20.000 USD and will send the usual js13kGames t-shirts to all of the participants (one t-shirt per entry) for free (with free shipping) just like in the previous years, and add tiny pendrives with all 2015 entries on them. To help me keep the competition going please 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.
Organizer of One Game A Month, currently working on a gamedev book and a strategy rpg. Creator of 40 games, 60 songs, 2 books, and an HTML5 platformer game starter kit, McFunkypants is an optimist disco viking and child of the arcade era. He has been an indie gamedev for over a decade.
Pablo Farías Navarro
Founder of Zenva and author of over 40 online courses on game, web and mobile app development, including a Kickstarter-funded course on how to make 15 games with Phaser. Trainer at the HTML5 Developer Conference, avid tutorial writer and massive HTML5 game dev nerd.
Founder and CEO of Famobi, a cross-platform game service with 300+ HTML5 games and high revenue-shares for developers and publishers. Before Famobi, Ilker founded SpielAffe.de and KralOyun.com, Germany's and Turkey's biggest online gaming portals. Also created Smarty Bubbles, the most successful cross-platform Bubble Shooter worldwide.
Winners - Desktop
1st place Behind Asteroids — The Dark Side by Greweb
2nd place Road Blocks by Ash Kyd
3rd place ChessPursuit by Saturnyn
4th place It's Raining... Boxes?! by Rémi Vansteelandt
5th place Taxi Drift by Rémi Vansteelandt
6th place Dungeon Advisor by Royletron
7th place Captain Reverso by GregPabian
8th place Invertagon by Pixel Jerry
9th place Sobanko by Fatfisz
10th place RoboFlip by Eoinmcg
11th place The Cursed Mirror by Morazor
12th place GeoQuiz by Xem
13th place Trapventure by Timo Hausmann
14th place Poust by Madmaw
15th place Relink by Daniel Cohen
- 16. Cargo-72 by ElementalSystems
- 17. It's a Lovely Day for a Drive by Jay Oster
- 18. Word Blast by Kushagra Gour
- 19. GLYPH-O-TRON by Nathan Blenke
- 20. Zodiac 13 by Herman Chau
- 21. TIME || ƎMIT by Daniel Johnson
- 22. Battle of Mages in the UniReverse by plissken2013es
- 23. Reverse the Darkness by Lhokktyn
- 24. Galactic Backfire by Rene Hangstrup Møller
- 25. Reversed: The Game by Mark Vasilkov
- 26. Ribbit Smash by Loktar
- 27. Rev. Emerald Mine by Zutatensuppe
- 28. Reverse Gravity Ninja by Marcguinea
- 29. Men In Maze by Iftah
- 30. Castle Climb by Rebecca
- 31-40. Fruit rev, R3V3RS3 IT, Glitchtris, Please die, rotatris, Grav Bot, Super Dragon Rescue, Riversed, Reverse and Try Again, Reverse Ground Battle
- 41-50. Fantastic Monster Chronicles, Dutch Dredge, Anti-Paradox Run, Flappy Box, ParaTec Systems, Shapes Love Numbers, PAPERTRON, Drawbacks, Move my World, Eugor
- 51-60. Roulette, Reversed Sandwich Maker, Squared Lines js13k Reversed, desreveR, Drake's quest 🏃, Bridge The Gap, Nova Runner, nbody, WooM, kfish
Winners - Mobile
1st place Behind Asteroids — The Dark Side by Greweb
2nd place Road Blocks by Ash Kyd
3rd place It's Raining... Boxes?! by Rémi Vansteelandt
4th place Sobanko by Fatfisz
5th place RoboFlip by Eoinmcg
6th place Poust by Madmaw
7th place Relink by Daniel Cohen
8th place Cargo-72 by ElementalSystems
9th place It's a Lovely Day for a Drive by Jay Oster
10th place GLYPH-O-TRON by Nathan Blenke
- 11. Galactic Backfire by Rene Hangstrup Møller
- 12. Reversed: The Game by Mark Vasilkov
- 13. Men In Maze by Iftah
- 14. Glitchtris by ViLPy
- 15. Riversed by Grzegorz Tańczyk
- 16. Reverse Ground Battle by Mattia Fortunati
- 17. Anti-Paradox Run by Fatfisz
- 18. Flappy Box by Towc
- 19. Shapes Love Numbers by Kakus
- 20. PAPERTRON by Csaba Csecskedi
Winners - Server
1st place Men In Maze by Iftah
2nd place PAPERTRON by Csaba Csecskedi
3rd place Captain Nicebeard by Patrick Woodcock
4th place Mud Bowl Derby by Jonas Olmstead
5th place raw | space by Bitowl
- 6. Bokosan by Gabor and Zsolt Heja
- 7. Ant Realm by Aurium
- 8. Shapewars by Claim
- 9. Alive'n'Loaded by Siorki
- 10. Nommon Brothers by Carson Barlow
Community Awards winners
Voted among the developers themselves.
- 1. Behind Asteroids — The Dark Side by greweb - 79 points
- 2. It's Raining... Boxes?! by Rémi Vansteelandt - 47
- 3. Road Blocks by Ash Kyd - 39
- 4. ChessPursuit by Saturnyn - 31
- 5. Captain Reverso by GregPabian - 28
- 6. cargo-72 by ElementalSystems - 17
- 7. Roulette by razh - 16
- 7. TIME || ƎMIT by Daniel Johnson - 16
- 9. The Cursed Mirror by morazor - 15
- 10. RoboFlip by eoinmcg - 13
- 11. Taxi Drift by Rémi Vansteelandt - 12
- 11. It's a Lovely Day for a Drive by Jay Oster (Parasyte) - 12
- 13. Dungeon Advisor by royletron - 10
- 13. Dutch Dredge by Rick van Mook - 10
- 15. TetRis by Chang Cheng-Hao - 9
- 16. Super Dragon Rescue by madmarcel - 8
- 16. Castle Climb by Rebecca - 8
- 16. Reverse and Try Again by halfnelson - 8
- 16. Flappy Box by towc - 8
- 16. GeoQuiz by xem - 8
- 16. Reverse the Darkness by lhokktyn - 8
- 16. ParaTec Systems by Logan Franken - 8
- 16. Poust by madmaw - 8
- 24. Void by Peter Bienek - 7
- 24. PAPERTRON by Csaba Csecskedi - 7
- 26-28. Reversed, Squared Lines js13k Reversed, Rotatris - 6
- 29. Ribbit Smash - 5
- 30-38. Sobanko, Driftversed, Please Die, GLYPH-O-TRON, Anti-Paradox Run, Galactic Backfire, Gravity Golf, Eugor, Nova Runner - 4
- 39-44. Bombs Away, Raw | Space, I Am Geoffrey, Bridge The Gap, Turnometry, R3V3RS3 IT - 3
Social Special winners
For the most popular games on the social networks.
- 1. Super Dragon Rescue by madmarcel - 131 tweets
- 2. Flappy Box by towc - 105 tweets
- 3. Road Blocks by Ash Kyd - 52 tweets
- 4. It's Raining... Boxes?! by Rémi Vansteelandt - 49 tweets
- 5. Behind Asteroids — The Dark Side by greweb - 48 tweets
- 1. Rev. Emerald Mine by Zutatensuppe - 127 likes
- 2. Bridge The Gap by Varun Malhotra - 94 likes
- 3. Bokosan by Gabor and Zsolt Heja - 80 likes
- 4. Changing World by adi - 79 likes
- 5. Flappy Box by towc - 44 likes
Firefox OS Special
Firefox OS Flames for the best mobile games handpicked by Mozilla staff.
10 × PlayCanvas Pro-5 account
Ten 6-month PlayCanvas Pro-5 accounts offering cloud-hosted, collaborative platform for building video games.
1 × Proto.io Startup account
One Proto.io account with Startup plan for 12 months.
3 × CodePen Pro account
Three CodePen Pro accounts with lots of cool features for 12 months.
5 × NodeBB hosting
Five Hamlet hosting plans for 12 months each from the NodeBB team.
1 × Blossom.io Enterprise account for 12 months
One Enterprise license for Blossom.io, agile project management tool.
3 × Pusher $300 credit
Three promo codes worth $300 each for the Pusher services.
3 × JScrambler license
Three JScrambler Starter Plan licenses for three months each.
There will be three different categories,
you can submit your game to any of them - it's up to you.
Full power of the hardware.
Mobile touch devices.
There will also be a Twitter, Facebook and Google+ Specials just like before,
and something new: Community Awards voted among all the participants.
Top 15 games
- 1st-3rd places: Isogenic Premium, Kendo UI Professional, WebStorm, PlayCanvas Pro-5, Gunslugs 1&2 and Heroes of Loot
- 4th-7th places: Isogenic Premium, WebStorm parsonal, PlayCanvas Pro-5, Gunslugs, Gunslugs 2 and Heroes of Loot
- 8th place: Isogenic Premium, PlayCanvas Pro-5, Gunslugs, Gunslugs 2 and Heroes of Loot
- 9th-10th places: PlayCanvas Pro-5, Gunslugs, Gunslugs 2 and Heroes of Loot
- 11th-15th places: Gunslugs, Gunslugs 2 and Heroes of Loot
Top 10 games
- 1st-2nd places: Phaser Box2D Premium, CodePen Pro, Build an HTML5 Game, From Null to Full, The Curious Expedition, The Marvellous Miss Take
- 3rd place: CodePen Pro, Build an HTML5 Game, From Null to Full, The Curious Expedition, The Marvellous Miss Take
- 4th-5th places: From Null to Full HTML5 Game, The Curious Expedition, The Marvellous Miss Take
- 6th-10th places: From Null to Full HTML5 Game, The Marvellous Miss Take
Top 5 games
- 1st-3rd places: Pusher $300 credit, NodeBB hosting, The Curious Expedition
- 4th-5th places: NodeBB hosting, The Curious Expedition
Top 25 entries (voted among developers themselves)
- 1st-2nd places: JScrambler license, Elliot Quest game, A Wizard's Lizard game, JSBin Pro for life with t-shirt and stickers
- 3rd place: JScrambler license, Elliot Quest game, A Wizard's Lizard game, JSBin Pro for 6 months with stickers
- 4th-6th places: Elliot Quest game, A Wizard's Lizard game, JSBin Pro for 6 months with stickers
- 7th-10th places: Elliot Quest game, A Wizard's Lizard game, JSBin Pro stickers
- 11th-25th places: A Wizard's Lizard game
Firefox OS Special
Top 3 mobile entries (handpicked by Mozilla staff)
- 1st-3rd places: Firefox OS Flame device plus special Mozilla Games t-shirt
Package size below 13 kB
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 allowed. Your game should work offline by launching the index.html file in the browser (Desktop and Mobile categories, not applicable to Server) and all the game assets should fit in the package size limit. 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 - Reversed
The main theme of the competition in 2015 is the word 'Reversed'. 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 2015
The competition starts at 13:00 CEST, 13th August 2015 and ends at 13:00 CEST, 13th September 2015. No submissions will be accepted after the end of the competition.
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.
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.
Errors and browser support
Your game must work and be playable in at least two browsers: Firefox and Chrome. The more supported browsers, the better - you can get more points for that. 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.
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.
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.
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, judging and announcing winners
The Social Specials contest will be held from the start of the compo on August 13th till the end of the judging on September 27th, winners will be announced on the same day right after it ends. The Community Awards voting among the participants will last for a week between September 13th and 20th, winners will be announced on September 21st. Judges will vote for the games during the two week period after the submission time ends: from September 13th till 27th, winners will be announced on September 28th.
Server category specific rules
- Sandbox server
- You can find the official sandbox server at js13kgames.github.io/js-game-server - it is maintained by Aurélio A. Heckert and Florent Cailhol.
- Package size still below 13 kB
- In this year one game package will contain all the game code and assets, for the client and the server.
- Sandboxed environment
- Your game will run in a node.js based sandbox environment. That means you will not really use node. You can require a limited collection of modules and your own modules shipped by your 13k pack.
- The allowed modules are:
- Assert, buffer, events, path, querystring, string_decoder, sandbox-io (a shimed version of socket.io already listening your game port) and sandbox-server (a shimed version of http.server already listening on your game port).
- Do not leak the sandbox
- This is not a hacking competition. This is a way to help the competition admins, the site persistence, and you. Trying to directly write files, to read files outside of your package, to use not allowed modules, to change the server port, or any other tries to leak the sandbox will cast you out of the competition.
- Yes, you can persist some data
- The sandbox has a global function "db(key[,value])". That can abstract the read/write json data from the disk for you. You must not use this feature to store assets, like essential game methods, images, or other data. Use it to game history or user related data. If you cheat the 13k limit using this feature you will be disqualified.
- Socket.io client lib
- You can use it. Simply add <script src="/socket.io/socket.io.js"></script> to your HTML and that will be loaded. No server configuration will be needed. The sandbox already did it.
- Respect your neighbours
- Besides the fact that you can be cast out if you deliberately affect another game by accessing files or it's server, you also have to try to not plunder the host computing resources. That is also needed to preserve the server health.
- Can I test the sandbox before submitting?
- Yes, you can and you must! Installing and getting it running is simple. Visit the project page at js13kgames.github.io/js-game-server.
- Is there any example? How do I develop my game using the sandbox server?
- There's an examples folder with the Pong game. You can also check out the Readme for details on running the server.
- I have more questions!
- Feel free to send them to email@example.com.
Frequently Asked Questions
- Why exactly 13 kB?
- Well... why not? :)
- What's in it for you? Are you getting paid?
- Nope, it's just my own idea and it's made for pure fun. I'd love to get a sponsorship though as I spent my own private money on the first edition to cover shipping of the prizes worldwide, making t-shirts etc.
- What does the "zipped" term exactly mean?
- Sent package should be zipped with your usual system archiver, the only allowed extension is .zip. Let's keep it simple - it's a competition for coders and this should be your main focus, the code itself. Thanks to the zipped archive you will easily send your game and we will easily check the file size.
- Can I use Flash?
- Can I use WebGL?
- Yes, though it might be hard to fit it into 13 kilobytes if you plan on doing an FPS game.
- Can I use CoffeeScript or TypeScript?
- Can I use compression through the self-extracting PNGs?
- More questions?
- Send them in via email or social media or post them in the dedicated topic at the HTML5GameDevs forums.
If You have any questions or propositions please feel free to contact us via e-mail: firstname.lastname@example.org.
The other options include visiting our profiles on Twitter or Facebook and sending us the private message.