This flash game is really great! The graphics and sound are well-done, and the puzzles are pretty sensible--I only had to look at hints for a couple of things (one of which I think was fairly-clued and I just missed, the other of which I think wasn't clued well enough, though in retrospect I can kinda see how it might have been clued).

There's actually more than one room--it's an entire little island with an outdoor area and several rooms in the lighthouse.

Thanks rivenwanderer.