JS1k: The JavaScript code golfing competition
2019 - Ten Year Js1k!
Mailing list | Update demo meta data | The /r/js1k subreddit
Check out demos from previous editions too! 2010 , 2010 , 2011 , 2012 , 2013 , 2014 , 2015 , 2016 , 2017 , 2018
Worm Trap
Click to free the worms. Multiple clicks to accelerate. Worms get trapped again, if they hit the box.
Upper Class Worms
Click and hold a mouse button to open the barrier. Try to get all worms to the upper layer.
Maximum overcast
Move with arrows. Smoother remake of my 2013 entry, but the weather is not as nice this year.
X-Painter
Move mouse and make your artwork: right click and save the image. Left click: stop and go.
ZzFX - zmall zoundz
ZzFX - A zmall open zource zound fx maker for your java zcript gamez
Mandelbrot X
Explore the Mandelbrot set with your mouse. Double click to toggle the corrupted X fractal. Zoom with the mouse wheel and change the iteration with 'Enter' and 'Space'
Colorguess!
Can you guess the RGB composition of a random color? You'll find out in this game!
Fractal Whirlwind
An animated Julia set in rainbow colors. Use the scroll wheel to change the speed. Refresh for a new experience!
Animated Functions
Math functions transforming into one another. Double click to disable non-continuous functions.
1st Order ODE Graph
Draw the slope field of a 1st order ODE and add object (type or click) to trace the equation.
One thousand Free Cells
FreecCell in 1k with randomly generated card art. What else is there to say?
Mini Riding Light
This demo shows the solar system to scale, from the point of view of a ray of light that escapes the sun. Click the planet names on the left to warp near them. Works best on Webkit. Say hi to 🌍 in 8 m…
World Map
World Map in under 1k. Built with JavaScript, delivered in ASCII. Map Projection: Kavrayskiy VII using Natural Earth and D3. GeoJSON (784kb) to ASCII (14kb) and crushed to JS1k
Andrioli Galaxy tour
Navigate with mouse with left button down to find bigger stars
HoMM1K
Capture the dragon roaming your kingdom! Click to move your knight. Click the minimap to pan the view.
1k Pool game
Aim with the mouse and press and release to fire. Try to get all the blue balls into the black holes.
Spaceship Randomizer
Generate and endless array of random spaceships. Click to generate a new ship.
Xplorer 2019
A & Z to move, Space to fire. Mind your energy! Fly low to recharge. How far can you get?
Strigiformes
Great grey owl, snowy owl, ural owl, long-eared owl and boreal owl. Inspired by Oleksandra Barysheva's art.
MiniMandelbox
Explorable Mandelbox! Click to start, move the mouse to guide the camera, refresh to see a different "scale" (random between 2 and 3). The scale is shown in the title!
Stealth bomber
You are flying a bomber plane and you can destroy everything you see on the ground.
Xenon
WARNING: has sound! Rotate your ship with the X key to collect Xs before your health runs out.
webgl2 initial support
stunning graphics, gpu sound right at your fingertips! likely you have to reload the page
Tiny Ski
Ski for your life! Use arrow keys to move. Press enter to restart after dying.
3D Grapher Calculator
3D expression visualiser! use X, Y as coordinates, F as frame, x and y as mouse coordinates. Move with mouse
Pixel Art Editor
Use palette and toolbar with the mouse or keys 1,2,3 for tools and 0 for the palette.
X Dive
Bring as many eggs as you can to the surface, and don't run out of air! Use arrow keys to move.
ShadowBoX
The shadow box comes alive 10 past midnight. Watch out for the spooky owl!
Psychedelic Crosses 2
X psychedelic fractal but more interesting recursion update. Mouse x = rotation, mouse y = color.
eXploring neural networks
Little neural networks eXploring the canvas - no interaction
MiniTwo3D
Choose a color, use the mouse to draw a 3D scene, layer by layer. Click "GO" to go to the next layer. Click "X" to reset. Right-click to erase a pixel/voxel.
Fractal Explorer
MouseWheel to zoom, Drag to move, Esc to reset. Change the exponent to 4... or -4!
X Roguelike
Mow down your enemies, find the eXit! Arrow keys to move, bump to use/attack/get
flux
A multi-part demo made up of 7 scenes and a soundtrack — click restart if you can't hear anything.
EscApe
Type any text, and it will be transformed in 21 different forms (HTML, JS, URL, hex + base64 for many encodings, and UTF-8 vs Windows-1252 Mojibake)
XmX The Board Game
A board game where you move the pieces until you capture the oponent. For 2 players.
Xcode - a CoreWars engine
Xcode is a Redcode implementation for JS1k to play CoreWars, where two programs ("warriors") battle to the death. Click the core to restart the fight.
Genorama
Continuously renders a procedurally generated terrain. The terrain is originally from a game created I helped create for #EnterTheMUD jam.
Mini Unicode Toys
This demo performs 25 text transforms in real time. Type anything! The output can be used on any webpage, program or social network. (⚠ Requires Chrome 72+)
Retro Neural Network
AI learns to draw the letter X with a multi-layer neural network and some 80's style flair.
1line text raycaster
One-line text ray-caster, where all you can see is just a line of text. Control with cursors.
Blue Marble
Rotating globe showing the Earth, with the radiance from the sun based on the current time and date.
dm1k
A 1k drum machine and step sequencer with sounds generated using the web audio API
Russian Block Game
Left, right and down arrow keys to move. Z and X to rotate clockwise and anti-clockwise
Spawn
You are red. Eat all the others. Click to create new cell within your body. Hold to expand it. You spawn on the left. Do not get eaten yourself. The bigger the window, the better.
ConvChain1k
The input pattern on the left is editable. Click on the result on the right to reset it. This is a simplified 1KB version of the ConvChain vanilla js port. The object of this algorithm is to generate…
Peach1Kastle
This demo shows a minimalist reproduction of Super Mario 64's Peach Castle rendered with CSS3D and emoji.
Period1K 2019
This demo represents a detailed periodic table of chemical elements. For the first time, each element has X (10) different pieces information!
Fourier Transform
Draw your doodle in one stroke and the script will convert it in a set of sinusoids represented on your screen as moving circles.
FlameJS
Remake of an Assembly/C demo I created XX years ago. Move you mouse around to draw.
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Space Fighter Revisited
In this new episode, our little ship must now face waves of ennemies. If one gets too close, it's game over. Use the keyboard arrows to rotate and spacebar to shoot!
Moon
Procedurally generate a black and white 2D planet/moon in GLSL. A new one is generated every 10 seconds.
Solar System
Model of the sun and 4 inner planets with moons, as they X the sky. Sizes, distances & speeds are approximately correct.
X
I wanted to make something with an X. This is a very simple ray tracer using sdf. I've added soft shadows and specular reflections.
SMB1-1k
A playable demake of the world 1-1 of Super Mario Bros on NES. Play with arrow keys. You die by touching the enemy or falling in a pit. Wou win by touching the flag. Video: https://twitter.com/MaximeE…
Fruit Crush Saga
Use your mouse to select and swap adjacent fruits, and make groups of 3 or more in line to gain points. With persistent high score.
Boxing 1K
A tribute to the Atari 2600/Activision classic: Boxing. Arrow keys to move, Z and X to swing.
Yars 1K
A tribute to another Activision classic: Yars' Revenge. Arrow keys move, space shoots and launches the cannon.
Sharked
Fish the rough waters with a couple of cold ones as you avoid the sharks. Hook a shark or run out of beer, and you're done. Up and down arrows to cast and reel in your line. Requires Unicode 9.0 (2016…
Draw it back.
Draw your background image. Right-Click on the single element (black borders square upon the clean button) to save it as an image ...
PBR Spheres
This is an implementation of basic PBR materials. The X coordinate defines the roughness of material and the Y defines how metallic it is. The implementation is based of Epic Games presentation of 201…
Planet Defense
Simple cartoonish game. Shoot all the meteorites with your turret before they reach the planet. Arrow keys to move the turret left and right, X to shoot, R to restart when the game is over.
Emojysics!
A 2D physics engine featuring emoji! Click to add an emoji, double-click to add a fixed circle. Video: https://twitter.com/MaximeEuziere/status/1092330191869931521
Planet flyby
A simple infinite runner. Use your mouse or touch the screen to change the position of the ship. Avoid the asteroids
Nyan Cat 2.0
Remake of a demo I submitted back in 2014, with added stars: https://js1k.com/2014-dragons/demo/1904 Original: https://youtu.be/QH2-TGUlwu4