The VIC-20 Hit of Magic Mirror, written I think in 1982 and published in 1983, original can be found here:
http://www.miketaylor.org.uk/tech/advent/mm/#gsc.tab=0 (http://www.miketaylor.org.uk/tech/advent/mm/#gsc.tab=0)
now converted to our CPC and published with the kind permission of it's original author Mike Taylor. Thanks a lot !
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You can find hints and maps and other versions at the authors homepage (see above) !