You're a military commander. Your forces were out on a routine patrol, and suddenly, the undead were everywhere! Your forces were badly depleted in the conflict, but you must continue to do your job and keep the undead population under control until a solution can be found!
You're a military commander and you must lead your troops safely to the extraction zone in each level, confronting the hordes of undead.
From Nintendo’s perspective the need for a revolution is much clearer. Since the 8-bit NES/Famicom from the 1980s, every Nintendo console system has declined in sales, even as the overall market has grown. Nintendo has thrived on the portable market, but the company has put itself on the brink of becoming a non-player in console systems.