Humble is at it again, jumping on the free train like: "This is the free train, hop in! Have some free! It's by the croutons and lemon-scented water. Enjoy!". So, uh, what's free exactly? It's Pyschonauts of course, one of the best adventure games ever.
Usually $10, Pyschonauts is currently zero bucks for the next 15 hours (at time of writing). All you have to do is "purchase" it from the Humble Store and you'll be sent a Steam key, along with the ability to download DRM-free versions.
Desktop support includes Windows, Mac and Linux.
While Psychonauts is an adventure game, it has action elements as well, mostly platforming. But don't let that stop you from checking out this amazing title. Who doesn't want to jump around a psychic summer camp, using all sorts of mental powers?
Everyone wants that. Everyone.
Psychonauts [Humble Store]