Valve has kicked off a huge midweek sale for a bunch of mystery games today. The sale, which ends February 13 at 10AM (PT), includes dozens of mystery titles for up to 75% off of their regular prices.

Some of the games you can pick up include The Vanishing of Ethan Carter, Max Payne 2, Alan Wake, Lifeless Planet, and many more.

Why the seemingly random sale that came out of nowhere?

That's one mystery these games won't help you solve.