Hot on the heels of GOG.com’s recent deal with Activision to sell DRM-free classic games, a handful of additional Sierra titles are now available alongside Gabriel Knight.

This week, you’ve got the psycho-erotic thriller Phantasmagoria for $10 or a three-pack of Space Quest games – 4, 5, and 6 – also for $10.

That’s pretty much a must-buy for Space Quest fans. I can’t speak to Phantasmagoria as I think I played it for about five minutes when it was part of some Sierra collection CD and then said, “Whelp! Back to King’s Quest III.”

Here’s the Space Quest trailer if you’re on the fence for some reason.

Sierra Games [GOG.com via Joystiq]