And from the looks of this demonstration, I think that this type of spherical drone is a lot more stable than a quadrocopter, thanks to its wings and gyroscopes.

FORBES: Japanese Defense Ministry Develops Spherical Flying Drone

"'Thief' is the grandfather of that type of game, " said Roy following a demonstration of "Thief" at last week's Game Developers Conference in San Francisco.

NPR: 'Thief' Slithering Into Next Generation Of Games