Don't be silly. You'd use it to kill other people.
Combining all these techniques leads to some spectacular mayhem. And the heroes, who comprise an elite commando unit called Overstrike 9, also gain individual Fuse powers like temporary invisibility and the ability to quickly heal teammates.
Overstrike 9's initial mission is to prevent Fuse from falling into the hands of a rogue defense contractor -- although, by the end of Fuse, you'll be so confused by the proliferation of freelancearmies that you'll have no idea who's on whose side. The hackneyed plot bounces from the Nevada desert to the ocean floor to outer space, but never takes the leap into somewhere truly imaginative.
One of the most disappointing aspects of this travelogue is that no matter how exotic the next locale -- say, a jungle compound or a snowy mountain range -- you're almost immediately dumped into a bland interior space. Perhaps you'll be surprised to discover that an air duct in an undersea lab looks just like an air duct in a space station.
More egregious, however, is the repetitious combat that sets in across the six Fuse missions. The rhythm quickly gets predictable: walk into a room, find cover, then blast away at waves of faceless troops. There's the occasional flamethrowing robot or missile-firing helicopter, but even their appearances become predictable. Once you've downed all the enemies, you take a breath, restock your ammo and maybe solve a rudimentary puzzle before trudging toward the next firefight.
If you're playing solo, the other three Overstrike agents are controlled by unreliable artificial intelligence that too often leaves you hanging when you're in trouble. You can leap among characters, which lets you sample all the different weapons, but Fuse is designed for four humans to play together online.
It's fitfully amusing to tackle a level with three friends, but most of the time I found myself wishing we were playing something more inventive. (Like 2K Games' Borderlands 2, which pulls off multiplayer gun battles with much more style and wit.) And the separate Echelon mode, in which your team fights increasingly deadly waves of enemies, doesn't have anything to distinguish it from the standard-issue horde mode found in almost every multiplayer game since Gears of War 2.
The blandness of Fuse is dispiriting, given that it was created by Insomniac Games, developer of the endlessly inventive Ratchet & Clank series. I do hope Insomniac can find that spark again, because Fuse just fizzles. One-and-a-half stars out of four.