Coming from a developer interview in the latest issue of Retro Gamer...

There is a cheat in the game, but I can't remember exactly how to do it. Basically, there is a flickering streetlight in the first street area after you wake up from the morgue. If you examine the Matchbox four times around the flickering light, you're teleported to a cheat room that contains a bunch of upgrades and gives access to all of the levels



Here we are 20 years later and a secret has just revealed itself.