Cyber's Antique Video Games Site
Boulderdash
Using the arrow keys guide your man - the green faced guy - around ten screens of mazes collecting enough diamonds in each to open up the exit at the bottom right of each screen. You can dig through the earth but don't let rocks fall on your head! The deadly creatures that inhabit the mazes must be avoided but you may have to kill the blue moths (by dropping rocks on them) to create enough gems to escape. On later levels you will have to make sure that the creeping green gunk doesn't take over the whole screen and there are a couple of underwater levels too!
N.B. Last time I checked, the Homepage for this Applet had been closed down!