Game Snake in source code (Quine). One can play this with batch or power scripts. The game can be finished =)

QuineSnake.bat

echo off

:LOOP
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" "QuineSnake.cs"
    "QuineSnake.exe" > "QuineSnake.cs"
    type "QuineSnake.cs"
goto LOOP

:END

QuineSnake.cs

using System;class E{static int A=4,B=10,M=1,D=5,Z=3,F=0;static int[]L={3,3};
static string a2(){int a=A,b=B,c=0,e=3,g=0,h,i,j,k,l,m,p,q=L.Length;var r=false;
var t=new int[10,20];t[M,D]=8;if(F!=1)goto X;for(int u=0;u<q;u++){c=L[u];int d=u
==0?Z:L[u-1];if(d==0||d==2){k=0;l=2;m=1;p=3;j=2;h=0;i=1;}else{k=1;l=3;m=0;p=2;j=
1;h=1;i=0;}if(u==0){if((Z!=k||c!=l)&&(Z!=l||c!=k))e=Z;else e=c;g=e==k?-1:1;A=A+g
*h;B=B+g*i;if(A<0||A>=10||B<0||B>=20){F=2;goto X;}if(t[A,B]==8)r=true;t[A,B]=5;}
if(u!=q-1||r)t[a,b]=c==m||c==p?c==m^d!=k?3:4:j;else t[a,b]=d==0||d==2?7:6;if(c==
0)b++;if(c==2)b--;if(c==1)a++;if(c==3)a--;}if(t[A,B]!=5){F=2;goto X;}if(r){t[a,b
]=c==0||c==2?7:6;F=3;for(h=0;h<10;h++)for(i=0;i<20;i++)if(t[h,i]==0)F=1;if(F==3)
goto X;var v=new Random();for(;;){M=v.Next(10);D=v.Next(20);if(t[M,D]==0){t[M,D]
=8;break;}}var w=new int[q+1];for(g=0;g<q;g++)w[g+1]=L[g];w[0]=e;L=w;}else{for(g
=q-2;g>=0;g--)L[g+1]=L[g];L[0]=e;}X:var R="";var x="\r\n";var s=new string('/',
20+4);R+=x+s+x;var y=" |-\\/O\"=*";for(h=0;h<10;h++){R+="//";if(F==1)for(i=0;i<
20;i++)R+=y[t[h,i]].ToString();else{var z=F==2?"Game Over!":"  Win!!!  ";int C=
20/2;R+=new string(' ',C-5)+z+new string(' ',20-C-5);}R+="//";R+=x;}R+=s+
"   QuineSnake by KvanTTT for GoStash"+x;return R;}static void Main(){if(F!=0){
int a=(int)Console.ReadKey(true).Key;Z=a<37||a>40?L[0]:a-37;}if(F==0)F=1;var R=a2();var s=
"using System;class E{{static int {10}={8},{11}={9},{12}={6},{13}={7},{14}={4},{17}={16};static int[]{15}={5};static string a2(){{int a={10},b={11},c=0,e=3,g=0,h,i,j,k,l,m,p,q={15}.Length;var r=false;var t=new int[10,20];t[{12},{13}]=8;if({17}!=1)goto X;for(int u=0;u<q;u++){{c={15}[u];int d=u==0?{14}:{15}[u-1];if(d==0||d==2){{k=0;l=2;m=1;p=3;j=2;h=0;i=1;}}else{{k=1;l=3;m=0;p=2;j=1;h=1;i=0;}}if(u==0){{if(({14}!=k||c!=l)&&({14}!=l||c!=k))e={14};else e=c;g=e==k?-1:1;{10}={10}+g*h;{11}={11}+g*i;if({10}<0||{10}>=10||{11}<0||{11}>=20){{{17}=2;goto X;}}if(t[{10},{11}]==8)r=true;t[{10},{11}]=5;}}if(u!=q-1||r)t[a,b]=c==m||c==p?c==m^d!=k?3:4:j;else t[a,b]=d==0||d==2?7:6;if(c==0)b++;if(c==2)b--;if(c==1)a++;if(c==3)a--;}}if(t[{10},{11}]!=5){{{17}=2;goto X;}}if(r){{t[a,b]=c==0||c==2?7:6;{17}=3;for(h=0;h<10;h++)for(i=0;i<20;i++)if(t[h,i]==0){17}=1;if({17}==3)goto X;var v=new Random();for(;;){{{12}=v.Next(10);{13}=v.Next(20);if(t[{12},{13}]==0){{t[{12},{13}]=8;break;}}}}var w=new int[q+1];for(g=0;g<q;g++)w[g+1]={15}[g];w[0]=e;{15}=w;}}else{{for(g=q-2;g>=0;g--){15}[g+1]={15}[g];{15}[0]=e;}}X:var R={1}{1};var x={1}{2}r{2}n{1};var s=new string('/',20+4);R+=x+s+x;var y={1} |-{2}{2}/O{2}{1}=*{1};for(h=0;h<10;h++){{R+={1}//{1};if({17}==1)for(i=0;i<20;i++)R+=y[t[h,i]].ToString();else{{var z={17}==2?{1}Game Over!{1}:{1}  Win!!!  {1};int C=20/2;R+=new string(' ',C-5)+z+new string(' ',20-C-5);}}R+={1}//{1};R+=x;}}R+=s+{1}   QuineSnake by KvanTTT for GoStash{1}+x;return R;}}static void Main(){{if({17}!=0){{int a=(int)Console.ReadKey(true).Key;{14}=a<37||a>40?{15}[0]:a-37;}}if({17}==0){17}=1;var R=a2();var s={1}{0}{1};Console.Write(s,s,'{1}','{2}{2}',R,{14},{1}{{{1}+string.Join({1},{1},{15})+{1}}}{1},{12},{13},{10},{11},{1}A{1},{1}B{1},{1}M{1},{1}D{1},{1}Z{1},{1}L{1},{17},{1}F{1});}}}}{3}";Console.Write(s,s,'"','\\',R,Z,"{"+string.Join(",",L)+"}",M,D,A,B,"A","B","M","D","Z","L",F,"F");}}

QuineSnake.ps1

while ($true) {
    &"C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" "QuineSnake.cs"
    ./"QuineSnake.exe" > "QuineSnake.cs"
    type "QuineSnake.cs"
}