Attendees of this evening's Metal Gear Solid 25th anniversary event in Japan are taking to Twitter with commentary on "Metal Gear Solid: Ground Zero" (we're also seeing "Metal Gear: Ground Zeroes"), a brand new stealth game starring the ever-stalwart Snake.

The demo reportedly showed Snake infiltrating a rain-drenched compound, avoiding search lights, offing a guard, driving a jeep and then summoning a helicopter in a seamless, open-world environment. The description meshes with designer Hideo Kojima's cryptic commentary on "Project Ogre," which he described as "very free."

We can likely expect a more formal demonstration and less secretive video from Kojima Productions in the near future. For now, the Twitter consensus paints the Fox Engine, which powers Metal Gear: Ground Zeroes, as something deserving of your oohs and aahs.

Update: First artwork added, with a larger version after the break.