In the hall of mirrors, walk into the right most mirror as far as you can without actually going through. At this point enter sos in morse code with the 'HELP' key. Sos in morse code is "...---...". 3 stabs of the 'HELP' key, then press it 3 more times at 1 second intervals and 3 more stabs. Your lives counter should be replaced with by an infinity symbol.