Minicheat from Lu Richardson.
When I read the last issue of Cheet Sheets, I saw someone was
playing this game - I wonder how many gave up at the end because of
the impossibility of investigating the switches under the city
without getting killed for lack of fresh hearts. Well, here is a
cheat which will enable you to finish the game. Use Norton's
Editor, or any other, on a saved game, go to offset 26C and type in
FF. This will give you 255 fresh hearts and should keep you alive,
with plenty to spare, right till the end.