Nightworld is an arcade style adventure game where you guide explorer Lee Lance around the different screens by jumping on to platforms and avoiding the nasties flying around at random. Exits are at first quite obvious but as the game progresses you have to find hidden passages which take you on to further screens. The solid triangles help you increase your score, but beware, greed is often fatal.
The format is not new but there are some unusual additions. After a set amount of time you are changed into a gargoyle. This gives you super powers, immunity to the nasties, and the ability to jump twice the normal height.
Instructions are brief and concise. I think a few hints and tips on where to look and what to look for would have been an advantage. As it is I have not yet been able to find out how to replenish my energy.
I was not addicted to this game, but if you like arcade adventures you will find it interesting and different.