Humble Bundle have gone and added a further three games to The Humble Indie Bundle 13. As well as picking up OlliOlli, Insanely Twisted Shadow Planet and Tower Of Guns for whatever you want, if you beat the average (currently $7.24) you'll now unlock Eldritch, The Novelist, and Tales From Space: Mutant Blobs Attack as well as the previously available Amnesia: A Machine For Pigs, Jazzpunk, and four copies of Risk Of Rain.
I'll be honest, I'm quite tempted by The Novelist, which sees you playing as a ghost that gets to muck about in the strained family life of a struggling novelist, uncovering familial secrets, and intervening in their lives. And then there's Eldritch -- a cracking little Lovecraftian roguelike that's sort of like a mashup of Minecraft and Spelunky and Cthulhu.
If you've already beaten the average, the games will unlock for you in the humble portal, but if you're yet to sample the delights of the latest Humble Indie Bundle, you've got just under a week to snap it up.