Macintosh owners and folks who use the Linux OS haven't been able to check out the Penumbra series of first person horror adventure games as one large title. But that's changing on Friday. Developer Frictional Games has announced that it will release The Penumbra Collection for Mac and Linux users on that day. The collection (Penumbra: Overture, Penumbra: Black Plague and the Penumbra: Requiem expansion) will be made available as one download rather than the original's "three downloads with three serials" version.

Beginning with the release on Friday and ending on Sunday you can download the Penumbra Collection for Mac and Linux for a mere $5. The price goes back up to its normal $20 on Monday.