Welcome to Harry Goes Home.
You must guide Harry through the minefield that surrounds his home. He must first pick up the key and then go to his house. The only thing he has to help him is a mine-detector, but that can only tell him how many mines are horizintally and vertically adjacent to him.
Move Harry by clicking on the four sides of the applet (e.g. click anywhere near the top to move up).
The java source code is available here. However, if you're really interested, here's the source code to a C version, which compiles and runs and requires no graphics!