You can now pick up the entire DROD series for £6.86 on PC, or cherry-pick the ones you want.
The promotion includes DROD 1-4, DROD RPG and DROD: The Second Sky. Halfway between traditional dungeon crawlers and brainteasing puzzlers, the DROD series may not be much to look at, but the games are unique and incredibly funny to boot. Now you can grab the lot and then probably never get around to playing all of them -- but hey, it's still a bargain.
Oh, and DROD stands for "Deadly Rooms Of Death." I knew you were wondering.