Mojang, the studio in front of the man behind Minecraft, was working on a first-person shooter with another company, Markus "Notch" Persson tells Joystiq. The collaboration and the project itself is now completely dead, Notch confirms, following today's news of a mysterious cancellation.The FPS was killed off in the prototype stage, not because it wasn't turning into a good game, but because Mojang "did not want more external dependencies," Notch says. "The success of Minecraft meant we could focus on projects fully owned by us."Future collaborations aren't out of the question for Mojang, as long as they're "not to make money. If there are other reasons to collaborate, maybe!"