International wildlife conservation charity Fauna & Flora is applying the Radiohead distribution model to securing donations. The organization has come out with a free mobile game called Silverback that, through gameplay, teaches about the difficulty of gorilla conservation in a "conflict zone," according to a 3G.co.uk post.

The eight-level game takes you through the life of a silverback gorilla, from baby to alpha male, and the challenges he faces in war-torn regions of Africa.

The Radiohead model comes in here: Although the game is free, Fauna & Flora is asking folks who like the game to make a donation of at least 10 bucks, but doesn't force anyone to open their wallet. Donations are accepted in pounds, dollars or euros.