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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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ximavus

function u(t) {

for(i=60;i--;){d="VannaZZZZZZZZZZZZZZZZZZpzzzzzzzzzzzp     ZbgggggbZ".charCodeAt(i);x.fillStyle=R(v=d/.6,v,v);x.fillRect(i*32,540-d,32,2*d)}

Nov 17 2025 12:31 PM UTC

}// 140/140

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Yes! Ray casting! change the d variable to change the world (encoded in char codes)

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rodrigo.siqueira

remix of d/34525 by u/rodrigo.siqueira

function u(t) {

𖦹:t?c.style.filter=`invert(`:𝕏=X=Y=0
for(i=3e4;i--;𝕏=X,x.fillRect(X*5e3-1400,Y*7600+2e3,t<3,.1))X=S(X*X-Y*.7*Y)+.285,Y=C(2*𝕏*Y+1.929)

Nov 16 2025 1:47 AM UTC

}// 133/140

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Spine

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ximavus

function u(t) {

x.reset()
for(i=60;i--;){x.fillStyle=R(s=S(t+i/9)*99+99,s,s);x.fillRect(i*32,540,32,S(C(i*32+t*9)+t*9)*500)}

Nov 15 2025 9:16 PM UTC

}// 108/140

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Wobbly sine-cosine

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ximavus

function u(t) {

x.reset()
F=_=>(i*9-9*30+S(t)*99)
for(i=60;i--;){x.fillStyle=R(s=S(i/20)*200,s,s);x.fillRect(i*32,540,32,F());x.fillRect(i*32,540,32,-F())}

Nov 15 2025 4:32 PM UTC

}// 139/140

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is that classified as 3D? A endless tunnel with the camera turning around I guess?

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ximavus

function u(t) {

x.reset()
F=_=>(270*S(i)+C(t)*270)
for(i=60;i--;){x.fillStyle=R(s=S(i/19)*2e2,s,s);x.fillRect(i*32,540,32,F());x.fillRect(i*32,540,32,-F())}

Nov 15 2025 9:09 AM UTC

}// 140/140

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This was gonna be a ray cast demo actually

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alexsav

remix of d/34522 by u/alexsav

function u(t) {

eval(unescape(escape`𩡯𬠨𭀿𢠽𦱢👃𚁔𚐬𫱮𫑯𭑳𩑭𫱶𩐽𩐽🡔👥𛡸𛰹𜀬𨐽𤰨𥀩𛁯𫡫𩑹𩁯𭱮👥🐾𚁘𚰽𢡛𪐽𩐮𭱨𪑣𪀦𝡝𛁚𚰽𢡛𪐫𜠦𝡝𚐬𛑢𛁶👷👣𛡷𪑤𭁨🐴𞀰𛀭𨑝𞡘👚🐹𞱶𞱒🱸𛡦𪑬𫁒𩑣𭀨𭠬𤠭𛐬𚁘𚱈𚡡𛑢𚠨𥠽𭠭𭰯𜠩𙡚𛑖𚡡𛑢𚡈𚐯𞐦𝀬𜐩𞡒👷𯁶𛐭𚑈👒𛐱𜰵`.replace(/u../g,'')))

Nov 15 2025 3:46 AM UTC

}// 140/140

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flyover

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rodrigo.siqueira

remix of d/34514 by u/rodrigo.siqueira

function u(t) {

t?c.style.filter=`invert(`:𝕏=X=Y=0
for(i=5e4;i--;𝕏=X,x.fillRect(2e3+Y*5e3,X*2900-680,t<5,.1))X=S(X*X-Y*.7*Y)+S(.3+t*t*t/99),Y=C(2*𝕏*Y+1.929)

Nov 14 2025 12:29 PM UTC

}// 140/140

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X-ray

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KilledByAPixel

remix of d/33124 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`󭌿󨬫󟜡󥌦󙬱󛼶󜌺󨬽󜌊󩭯󬬨󨼮󭽩󩍴󪍼󟝩󟜶󜬻󪜭󛜻󚝦󫽲󚍪󟜨󬜽󪜾󜜩󟼴󝬹󞬭󜬹󞽪󚼫󟌨󬜿󝜺󝌮󝜫󪜯󜬩󚬹󞜻󫽮󨽬󪝣󪼽󧼽󟭔󟜡󥌩󮌮󩭩󫍬󤭥󨽴󚌹󞜰󚽪󚭓󚍡󟜨󬜿󪜯󝬰󞭩󟽢󛼵󞬨󨭼󜌩󛼶󜌩󙜱󚬶󛬲󞌩󛌵󝌰󛝪󚭃󚍡󚜬󬬽󬜿󪜥󝜿󜼺󜜵󞬱󞜭󪜪󜜳󛍲󚜻`.replace(/u../g,'')))

Nov 14 2025 5:52 AM UTC

}// 137/140

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Analog Stopwatch ⏱️

u/cantelope

i?b/5 -> i?b for accurate minor hand motion. /5 chosen for aesthetics?
u/KilledByAPixel

yeah, i think this is pretty common for analog stopwatches because otherwise 1 per second is very fast
u/ximavus

Ooh nice

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alexsav

remix of d/23034 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`𩡯𬠨𭰽𪠽𨰮𭱩𩁴𪁼👴🱊👛𨠽𠰨𥀩𛀬𨐽𤰨𥀩𛁯𫡫𩑹𩁯𭱮👥🐾𚁘𚰽𢡛𪐽𩐮𭱨𪑣𪀦𝡝𛰹𛁚𚰽𢡛𪐫𜠦𝡝𛰹𚐬𛑢𛀬𛑡𧐺𦀽𦠽𝰻𪠻𤠽𦀭𤠪𤰨𡀽𥀫𪠯𭰭𛠵𚐦𦠫𤠪𠰨𡀩🱒𚰮𜐺𘑸𛡦𪑬𫁒𩑣𭀨𪠭𛐬𝐴𜀭𜑥𜰯𤠬𜠯𤠬𭰯𤠩𚑯𫡭𫱵𬱥𫑯𭡥👥🐾𥀽𩐮𮀯𞐰`.replace(/u../g,'')))

Nov 13 2025 3:29 AM UTC

}// 140/140

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WASD + Mouse 3D engine (try moving mouse first)

u/cantelope

iddqd? idkfa? the cheat codes, they do nothing!
u/ximavus

This one is amazing. I still can't get any 3D working
u/alexsav

Details here: https://github.com/alexsave/dweets/tree/main…
u/tomxor

@cantelope, noclip works 😄

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ximavus

remix of d/34519 by u/KilledByAPixel

function u(t) {

c.width|=onclick=_=>T=!T
t?a+=!T&&1/60:a=0
x.font='5in"'
x.fillText(a.toFixed(2),560,700)
onkeydown=_=>{a=0;T=1}

Nov 12 2025 4:44 PM UTC

}// 112/140

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Removed the moving box to add reset. You can use it to test your reflexes now

u/cantelope

fair remix
u/ximavus

credit to u/KilledByAPixel the original is very nice
u/ximavus

my pb on this one is 0.13