Metal Gear Mk. II Credit: Metal Gear Mk. II

For those that prefer to keep their Metal Gear Solid 4 gameplay stealthy, the Mk. II is a godsend. Control this little bot with your six-axis and dispatch enemies with an electric charge. Plus, it adds some much needed humor to the otherwise dark storyline. Yeah, it might not be the most useful weapon in Snake's inventory, but it may be the most fun.