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function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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    u(t) is called 60 times per second.
    t: Elapsed time in seconds.
    S: Shorthand for Math.sin.
    C: Shorthand for Math.cos.
    T: Shorthand for Math.tan.
    R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5)
    c: A 1920x1080 canvas.
    x: A 2D context for that canvas.

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Current theme challenge: #Food

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lewdev

remix of d/34331 by u/ximavus

function u(t) {

onmousemove=e=>{r=c.getBoundingClientRect();x.fillRect((e.x-r.left)*c.width/r.width,(e.y-r.top)*c.height/r.height,9,9)}

Sep 17 2025 7:32 PM UTC

}// 119/140

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🎨Paint on any Canvas size (I liked the simplicity of the original though)

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ximavus

function u(t) {

onmousemove=m=>{x.fillRect(m.x, m.y, 5, 5)}

Sep 17 2025 3:29 PM UTC

}// 43/140

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Paint (better with fullscreen)

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ximavus

function u(t) {

x.beginPath();
onmousemove=e=>{x.moveTo(e.x, e.y);x.lineTo(e.x*3, e.y*3);x.stroke();}

Sep 17 2025 3:24 PM UTC

}// 85/140

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Mouse demo

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KilledByAPixel

remix of d/34231 by u/KilledByAPixel

function u(t) {

with(x)for(t||translate(960,540),j=6;j--;)for(i=96;--i;fillRect(T*S(i+i*t/T),-0,5,T=5e3))fillStyle=`hsl(${i*t/4} 99%${i}%`,rotate(Math.PI/3)

Sep 16 2025 4:12 PM UTC

}// 140/140

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Pinwheels 🌸

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rodrigo.siqueira

remix of d/34296 by u/rodrigo.siqueira

function u(t) {

for(i=2e3;i--;x.fillRect(i,t*120,.6,z*2))for(z=0,j=7;--j;x.fillStyle=`hsl(${Y*Y+180},40%,${Y*9}%)`)z-=S(Y=S(t/j)*j-S(z+t)*5+j)**2-S(i/30/j)

Sep 16 2025 12:18 PM UTC

}// 139/140

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Pond surface

u/KilledByAPixel

nice one!
u/joeytwiddle

Beautiful #water #pond #scene

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rodrigo.siqueira

remix of d/34288 by u/DazeWare

function u(t) {

for(i=2e3;i--;x.fillRect(i,t*120,.6,z*2))for(z=0,j=9;--j;x.fillStyle=`hsl(${Y*Y},80%,${Y*9}%)`)z-=S(Y=S(t/j/3)*j-S(z)*5+j)**2+S(i/40/j)

Sep 15 2025 7:38 PM UTC

}// 135/140

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Golden Suminagashi

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KilledByAPixel

function u(t) {

z='🐈'
eval(unescape(escape`󨼮󭽩󩍴󪌽󭼽󝜰󜌊󩭯󬬨󪬽󜜹󞽪󛜭󞽸󛭦󪝬󫍔󩝸󭌨󮬬󜬸󜌬󜜵󝜫󤼨󭌪󜬩󚬹󞜩󚝦󫽲󚍸󛭦󪝬󫍓󭍹󫍥󟝠󪍳󫌨󙍻󪬪󪭽󘌹󞜥󙍻󪬦󙬵󜍽󙝠󛍩󟝷󞽩󛜭󞽸󛭦󫽮󭌽󙼳󩝭󘬧󚝸󛭦󪝬󫍒󩝣󭌨󪜬󜬲󜌭󠼨󪜯󝜰󛝴󚬴󚜪󜼹󚼨󪬦󙭪󚭪󚽷󛝩󚽴󚬲󜌰󚜥󞜹󛌱󛌹󚜻`.replace(/u../g,'')))

Sep 15 2025 2:02 PM UTC

}// 140/140

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Play L1ttl3 Paws! 🐾 https://js13kgames.com/2025/games/l1ttl3-paws

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KilledByAPixel

function u(t) {

eval(unescape(escape`󭌿󨼮󭽩󩍴󪍼󟝯󫭣󫍩󨽫󟝥󟜾󥼽󝜰󞭘󟝙󟝖󟝗󟜳󒭘󚼽󥬬󦜫󟝗󚼽󛬵󒭦󫽲󚍩󟜲󩜳󞽩󛜭󞽸󛭦󪝬󫍒󩝣󭌨󪜭󞜬󫼿󪌺󦜼󪌿󦜺󚌊󩌽󤼨󦌯󞜰󚜬󫬽󛝤󚬨󫜽󜜯󚍤󚭤󚼱󚜪󚬮󝜩󛍖󛜽󫬪󟝥󟝖󚭮󚽗󚭭󛍗󛜽󫜪󟝥󛍙󟝨󚜬󜜸󛍯󟽨󞬭󞜹󚜩󫼽󪜭󜝥󜼬󪌽󞜰󜌭󠼨󚍯󚽘󚜯󞜰󚜪󞜰`.replace(/u../g,'')))

Sep 14 2025 10:02 PM UTC

}// 140/140

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Tiny Tiny Wings 🐧 #interactive

u/KilledByAPixel

Click to get downward speed, glide into the curves to ramp up.
u/tomxor

Nice mini game idea.
u/KilledByAPixel

Thanks! Been trying to get this to fit for a while until I remembered there is a trick to get the normal of a sine wave that allowed enough space to fit.
u/KilledByAPixel

As a goal to the game, try to reach the top of the dweet!
u/lewdev

Wee! It's so satisfying keeping a good jump going!

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rodrigo.siqueira

remix of d/34288 by u/DazeWare

function u(t) {

for(i=2e3;i--;x.fillRect(i,t*90,.4,z/2))for(z=0,j=9;--j;
z-=+F(Y=S(t/j)*j/3-2-S(z+j)*5+j,X=i/9/j)+Y/5)F=k=>S(Y)*2-S(X)/3+S(X/6)

Sep 14 2025 2:22 PM UTC

}// 127/140

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Details of Suminagashi technique

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tactical_retard

remix of d/34282 by u/rodrigo.siqueira

function u(t) {

for(x.fillRect(x.globalAlpha=.1,0,i=2e4,i),h=540;i--;x.clearRect(960-.4/C(i*i+t)/Z*1e3,h+S(l)/S(i)/Z*h,s=4/Z+3,s))Z=C(l=i*i+t/2)/S(i)+2+1/t

Sep 13 2025 9:27 PM UTC

}// 139/140

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