diff --git a/install/demo/blackbox.pp b/install/demo/blackbox.pp
new file mode 100644
index 0000000000..8b85ab36b8
--- /dev/null
+++ b/install/demo/blackbox.pp
@@ -0,0 +1,172 @@
+Program blackbox;
+{
+  (c) 1998 Michael Van Canneyt
+  
+  The object of the game is simple : You have a box of 9x9x9 cells.
+  you can enter a number of atoms that will be put in the box.
+  Then you can start shooting in the box with a laser beam.
+  You enter the coordinates where the beam enters the box.
+  (this must be on the edges, this means that one of the coordinates
+  must be 1 or 9...)
+  The beam will bounce off the atoms (using normal bouncing), and you 
+  will be told where the beam exits. 
+  From this you must guess where the atoms are...
+}
+
+Const MaxSize = 9;
+      MaxAtom = 10;
+      
+Type TRow   = Array [0..MaxSize+1] of byte;
+     TPlane = Array [0..MaxSize+1] of TRow;
+     TCube  = Array [0..MaxSize+1] of TPlane;
+
+Var
+  Cube                 : TCube;
+  Count,Guessed,x,y,z  : Longint;
+  ans : string;
+  
+Procedure FillCube;
+
+var i,x,y,z : longint;
+
+begin
+  randomize;
+  for x:=0 to maxsize+1 do
+    for y:=0 to maxsize+1 do
+      for z:=0 to maxsize+1 do
+        Cube[x,y,z]:=0;
+  repeat
+    Write ('Enter number of atoms (1-',maxatom,') : ');
+    readln (count);
+    if (count<1) or (count>MaxAtom) then 
+      writeln ('Invalid value entered. Please try again.');
+  until (count>0) and (count<=MaxAtom);
+  for I:=1 to count do
+     begin
+     repeat
+       x:=Random(MaxSize)+1;
+       y:=Random(MaxSize)+1;
+       z:=Random(MaxSize)+1;
+     until Cube[x,y,z]=0;
+     Cube[x,y,z]:=1;
+     end;   
+end;
+
+Procedure GetCoords (Var X,y,z : longint);
+
+begin
+  Write ('X : ');
+  readln (x);
+  write ('Y : ');
+  readln (y);
+  write ('z : ');
+  readln (z);
+end;
+
+Procedure GetStart (Var x,y,z : longint);
+
+Var OK : boolean;
+
+begin
+  Writeln ('Please enter beam start coordinates : '); 
+  Repeat
+    GetCoords (x,y,z);
+    OK:=((X=1) or (X=MaxSize)) or ((y=1) or (Y=MaxSize)) or
+        ((Z=1) or (z=maxsize));
+    if Not OK then 
+      writeln ('The beam should enter at an edge. Please try again');
+  until OK;
+end;
+
+Function GetGuess : boolean;
+
+Var OK : boolean;
+    x,y,z : longint;
+    
+begin
+  Writeln ('Please enter atom coordinates : '); 
+  Repeat
+    getcoords (x,y,z);
+    OK:=((X>=1) or (X<=MaxSize)) or ((y>=1) or (Y<=MaxSize)) or
+        ((Z>=1) or (z<=maxsize));
+    if Not OK then 
+      writeln ('These are not valid coordinates. Please try again');
+  until OK;
+  GetGuess:=False;
+  If Cube[x,y,z]<0 then
+    Writeln ('You already had this one ! Trying to be clever, eh ?')
+  else if Cube[x,y,z]>0 then
+    begin
+    Writeln ('Correct guess !');
+    Cube[x,y,z]:=-Cube[x,y,z];
+    getguess:=true;
+    end 
+  else
+    Writeln ('Wrong guess !');
+end;
+
+Procedure CalcExit (X,Y,Z : longint);
+
+var tx,ty,tz,dx,dy,dz : longint;
+
+begin
+  dx:=0;dy:=0;dz:=0;
+  if x=1 then dx:=1 else if x=MaxSize then dx:=-1;
+  if y=1 then dy:=1 else if y=MaxSize then dy:=-1;
+  if z=1 then dz:=1 else if z=MaxSize then dz:=-1;
+  writeln ('Direction : ',dx,',',dy,',',dz);
+  repeat
+  for tx:=-1 to 1 do
+    for ty:=-1 to 1 do
+      for tz:=-1 to 1 do
+        if Cube [X+tx,y+ty,z+tz]<>0 then
+          begin
+          dx:=dx-tx;
+          dy:=dy-ty;
+          dz:=dz-tz;
+          end;
+  if dx<>0 then dx:=dx div abs(dx);
+  if dz<>0 then dz:=dz div abs(dz);
+  if dy<>0 then dy:=dy div abs(dy);
+  x:=x+dx;y:=y+dy;z:=z+dz;
+  until ((x=0) or (x=MaxSize+1)) or ((y=0) or (y=maxsize+1)) or 
+        ((z=0) or (z=maxsize+1)); 
+  Writeln ('Beam exited at : (',x-dx,',',y-dy,',',z-dz,')');
+end;
+
+Procedure DumpCube ;
+
+Var x,y,z : longint;
+
+begin
+  for x:=1 to MaxSize do
+    for y:=1 to maxsize do
+      for z:=1 to maxsize do
+        if Cube[x,y,z]<>0 then 
+          writeln ('Atom at (',x,',',y,',',z,')');
+end;
+
+begin
+  FillCube;
+  Guessed:=0;
+  Repeat
+    repeat
+      Write ('Shoot, guess or quit (s/g/q) : ');
+      readln (ans);
+      ans[1]:=Upcase(ans[1]);
+      if not (ans[1] in ['S','G','Q']) then 
+        writeln ('Invalid entry. Please try again.');
+    until ans[1] in ['S','G','Q'];
+    Case ans[1] of
+     'S' : begin
+           getstart (x,y,z);
+           calcexit (x,y,z);
+           end;
+     'G' : If GetGuess then Inc(Guessed);
+    end;
+  until (ans[1]='Q') or (guessed=count);
+  If Guessed=count then
+    Writeln ('Congratulations! All ',Count,' correct !')
+  else
+    Writeln ('Only ',guessed,' out of ',count,' correct...');  
+end.