Was the phrase used in The Perl Journal which kept me from submiting this. However, I think it's pretty nice, and I have made it as short as I know how. 
sub q{$;=1;for(0..3){$;[$_]=int(rand(9))}}sub _{print@_}&q;for(;;){$:=
+$~=0
;_"$/$; ";$_=<>;if(/^\d{4}$/){@q=split//;--$#q;$@=-1;for(@q){$a=$_;($a
+==$;
[++$@])&&++$:||(grep/$a/,@;)&&++$~}_"$~W$:B ";++$;;$:==4|$;>10&&_(@;)&
+&&q}}

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In reply to "Another thrice-damned version of Mastermind" by tinypig

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