Some people on the forums may know of the anime Attack On Titan
Now, it is very simple, like on the show, it launches grapples to your designated area, then you can grapple over where you want to go, but I was thinking it would require fuel to use the 3DMG, and there would be a event to refill the fuel for the device, And a knew weapon, A flare gun that launches different colored flares, like on the anime, If anyone can do this than I will be greatful of your great doings, good luck gentlemen
