A while back I bookmarked a site that had a very intriguing flash game with an interesting side soundtrack. With the holiday approaching, I revisited the site and found its sister sites as well. I strongly suggest that you visit theskeletonshop.com, johnnyhollow.com, and mypetskeleton.com. All the sites are a quite dark and gothic, and not quite for the kiddies.
I’d suggest if you just visit one site, visit johnnyhollow.com. They have an amazing flash based navigation with great art, haunting audio, and the best use of riddle/reward system I’ve seen yet. If you get stuck with the riddles, send me a line and I’ll help you out.