I have created a mini-game using your scenes from Kings Quest I. You can download it here:http://www.filefactory.com/file/cda259c/n/KQ1-3D.zip
In the text box you can type in north, south, east, west, n, s, e, w to move to another scene. When you're in the scene with the sword under the rock, type "move rock" to move the rock, then type "take sword" to take the sword. Only lower-case letters may be used. Press the Tab key to check your inventory, and press Ctrl-Q to exit the game.
Daventry, if you would like to develop this further, let me know and I'll send you the source code and provide help if you need it. It's really easy to do; the mini-game only took me about an hour to create.