Not any major changes but it seems a bit nicer looking on the eyes and in a terminal.

 map{sub __;$/=$_;sub _;map{$g[$/][$_]{c}=rand(time)%2;push@{$g[$/][$_
+]{n}}, (
 \$g[_$/][ $_]{c} =>\$g[__$/][  $_]{c}=>\$g[  $/][_$_]{c}=>\$g[  $/][_
+_$_]{c},
 \$g[_$/][_$_]{c} =>\$g[_ $/][__$_]{c}=>\$g[__$/][_$_]{c}=>\$g[__$/][_
+_$_]{c},
 )}(0..$s)}(0..($s=(shift or 23)-1));sub __{(($m=shift)+1)<=$s?$m+1:0}
+ sub _ {
 (($m=shift)-1)>=0?$m-1:$s}__;__;while(1){map{$/=$_;map{print$g[$/][$_
+]{c}?'*':
 '.'; $u+=$$_ for(@{$g[$/][$_]{n}});$t[$/][$_]{c}=$g[$/][$_]{c};$t[ $/
+][$_]{c}
 =($u==3?1:($u !=2?0:($t[$/][$_]{c}==1?1:0)));__;$u=~s _.__;}(0..$s);p
+rint"\n";
 }(0 .. $s);map{$/=$_; map{$g[$/][$_]{c}=$t[$/][$_]{c}}(0..$s)}(0..$s)
+;_;_;
 __;_;__;_;__;_;__;_;sleep 1}__;_;__;_;_;__;_;__;_;_;__;_;__;_;_;__;_;
+__;_;__;
[download]

--
perl -p -e "s/(?:\w);([st])/'\$1/mg"