When Konami revealed the first trailer of gameplay to Metal Gear Solid: Rising this past E3
, many Metal Gear fans were worried at seeing Raiden slicing and dicing through enemy soldiers without any regard to stealth or casualty count. This year's GamesCom, however, has brought some clarification that MGS: Rising does hold true to Metal Gear tradition in that you can sneak through the game without actually killing anyone.
While the E3 trailer placed a heavy emphasis on being able to slice anything from soldiers to environments and even watermelons, Konami has clarified that you will never be rewarded in Rising for killing humans. There will, however, be many non-living enemies you can cut, and slicing can be strategically performed to disable enemy weapons instead.
Speaking on the topic of stealth, Konami also suggested that while stealth remains an important part of the gameplay, Raiden's style of sneaking around is inherently different than Snake's because of Raiden's acrobatic ninja skills. Described as using "hunting stealth," Raiden will spend less time waiting for enemies to walk by and will instead be able to move up to them more easliy while remaining in stealth mode.
Source: [IGN] Gamescom: No-kill Game Possible in Metal Gear Rising