Manic Miner

Check out my Willy! Miner Willy that is, in this expanded remake of Matthew Smith's classic ZX  Spectrum game. Play all twenty original caverns  from the Spectrum version  or select to play the twenty brand new ones - or mix it up a bit and let the game decide what screens you're going to play! You can even play with subdued lighting, darkening the caverns and using the light from Willy's hard hat.

Here's the story from the original cassette inlay:

Miner Willy, while prospecting down Surbiton way, stumbles upon an ancient, long forgotten mine-shaft. On further exploration, he finds evidence of a lost civilisation far superior to our own, which used automatons to dig deep into the Earth's core to supply the essential raw materials for their advanced industry. After centuries of peace and prosperity, the civilisation was torn apart by war, and lapsed into a long dark age, abandoning their industry and machines. Nobody, however, thought to tell the mine robots to stop working, and through countless eons they had steadily accumulated a huge stockpile of valuable metals and minerals, and Miner Willy realises that he now has the opportunity to make his fortune by finding the underground store. 

In order to move to the next chamber, you must collect all the flashing keys in the room while avoiding nasties like POISONOUS PANSIES and SPIDERS and SLIME and worst of all, MANIC MINING ROBOTS. When you have all the keys, you can enter the portal which will now be flashing. The game ends when you have been 'got' or fallen heavily three times.