snake game in 1020 Bytes (941 Bytes without colors) HTML CSS & JS
[ instructions ]
use arrow keys to start the game and move the snake ooo
avoid the walls ###
and try to catch the + to grow
refresh the page if you die xxx
you can copy paste the source below in a file and save it as .html and it will work
[ source (with colors) 1020 Bytes ]
<pre style="letter-spacing:8"id="A"><script>Y=200;P='o';J=' ';N=15;C='#';E='+';m=[];X=C.repeat(N+2);for(T in X)m[T]=C+J.repeat(N)+C;m[0]=m[0].slice(0,-2)+E+C;m.unshift(X);m.push(X);function s(a,b,c){return a.substring(0,b)+c+a.substring(b+1)}function f(){e=setInterval(function w(){if(!z){R=p.length-1;if(h=p[R][0],j=p[R][1],h=1==d?h-1:h,h=-1==d?h+1:h,j=2==d?j-1:j,j=-2==d?j+1:j,p.push([h,j]),g=p.length-1,l=m[h][j],r){if(J!=l)if(E==l){x=y=0;for(t++,k=1;J!=m[x][y];)with(Math)x=~~(random()*N+2),y=~~(random()*N+2);m[x]=s(m[x],y,E);Y-=5}else z=1,P='x';!k&&t<g&&(b=p[g-t],m[b[0]]=s(m[b[0]],b[1],J)),k=0}for(a='',i=0;i<t;i++)i<g+1&&(b=p[g-i],m[b[0]]=s(m[b[0]],b[1],P));for(b in m){for(K in m[b])H=m[b][K],a+=H.fontcolor(/\#/.test(H)&&"#03B"||/\w/.test(H)&&"#2B2");a+="\n"}A.innerHTML=a}return w}(),Y)}t=3,p=[[1,1]];var i,z,r,k,d;f(),window.addEventListener("keydown",function(k){if(c=k.keyCode,-1!=[37,38,39,40].indexOf(c))with(Math)D=1==abs(39-c)?39-c:2*(38-c),z||abs(D)!=abs(d)&&(d=D,clearInterval(e),f(),r=1)});</script>[ source (no colors) 941 Bytes ]
<pre style="letter-spacing:8"id="A"><script>Y=200;P='o';J=' ';N=15;C='#';E='+';m=[];X=C.repeat(N+2);for(T in X)m[T]=C+J.repeat(N)+C;m[0]=m[0].slice(0,-2)+E+C;m.unshift(X);m.push(X);function s(a,b,c){return a.substring(0,b)+c+a.substring(b+1)}function f(){e=setInterval(function w(){if(!z){R=p.length-1;if(h=p[R][0],j=p[R][1],h=1==d?h-1:h,h=-1==d?h+1:h,j=2==d?j-1:j,j=-2==d?j+1:j,p.push([h,j]),g=p.length-1,l=m[h][j],r){if(J!=l)if(E==l){x=y=0;for(t++,k=1;J!=m[x][y];)with(Math)x=~~(random()*N+2),y=~~(random()*N+2);m[x]=s(m[x],y,E);Y-=5}else z=1,P='x';!k&&t<g&&(b=p[g-t],m[b[0]]=s(m[b[0]],b[1],J)),k=0}for(a='',i=0;i<t;i++)i<g+1&&(b=p[g-i],m[b[0]]=s(m[b[0]],b[1],P));for(b in m)a+=m[b]+"\n";A.innerHTML=a}return w}(),Y)}t=3,p=[[1,1]];var i,z,r,k,d;f(),window.addEventListener("keydown",function(k){if(c=k.keyCode,-1!=[37,38,39,40].indexOf(c))with(Math)D=1==abs(39-c)?39-c:2*(38-c),z||abs(D)!=abs(d)&&(d=D,clearInterval(e),f(),r=1)});</script>A commented version of the code can be found in this blog post