Steam has kicked off its Exploration Sale, discounting a number of popular franchises, several adventure games, and a whole lot more. In addition the Fallout and Tom Clancy series, the Cid Meier's Civilization and Company of Heroes franchises have all received considerable markdowns as high, as 75 percent off. It's worth noting, however, that Fallout 4 is not among the Bethesda-developed post-apocalyptic RPGs featured in the sale. Other key discounts include Ori and the Blind Forest, ARK: Survival Evolved, and Darkest Dungeon, all of which are currently 40 percent off.