Minecraft is such a successful formula that it's making money even for games that aren't Minecraft. Take, for example, FortressCraft, an Xbox Live Indie game whose title and gameplay are eerily similar to Mojang's indie megahit, almost as if that were the express purpose of the game.

According to developer ProjectorGames, FortressCraft has become the highest-grossing XBLIG release ever, bringing in over a million bucks with approximately 350,000 copies sold. To be fair, the developer thinks of it more as an amalgam of Dwarf Fortress and Minecraft, and plans to add more divergent elements in the future, but we're not sure that's how the people buying it think of it.

In any case, ProjectorGames should probably hang onto that million, because sales might slow a bit when it has to compete with for-real Minecraft.