$A  = "H";           # $A is "H"
$= .= /A/-65;        # leave $= set to its default of 60. Just misdirection.
$; = $A.$; ;         # $; is "H"
$#{($;or$A)}="J";    # Set the last index value of @H to J. Just misdirection.
$_=$#{_}- -75;       # The index of the last element @_ is -1 + 75 so $_ is 74
chr;                 # return true (Do nothing)
print chr;           # Print char corresponding to ascii value 74 that is "J"
$; =~ s/^(H)./AP$1/; # Change $; from H to APH
print $; ;           # Print $; that is APH
-85                  # Return false. Game over.