"Metal Gear" was the first mainstream stealth game, with the player starting the game unarmed, and sold over a million copies in the United States. "Metal Gear 2: Solid Snake" evolved the stealth gameplay of its predecessor and is considered one of the best 8-bit games of all time. "Metal Gear" and "Metal Gear 2" are credited with pioneering stealth mechanics. "Metal Gear Solid", which debuted at the 1996 Tokyo Game Show, was the first 3D stealth game, and is credited with popularizing the stealth game genre, as well as the hiding-behind-cover mechanic. The series pioneered the integration of cinematic techniques into video games, especially "Metal Gear Solid" which Eurogamer considers the "first modern video game".