Although a third Super Smash Bros. game had been announced long before E3 2006, Nintendo unveiled its first information in the form of a trailer on May 10, 2006, and the game was named Super Smash Bros. Brawl. The trailer featured Solid Snake, of Konami's Metal Gear fame, marking the first time that a third-party character had been introduced as a playable character in a Super Smash Bros. title. A second third-party character, Sonic the Hedgehog, from Nintendo's former rival Sega was also confirmed as a playable character on October 10, 2007. Super Smash Bros. Brawl was released in Japan on January 31, 2008, in North America on March 9, 2008, in Australia on June 26, 2008, and Europe on June 27, 2008. Brawl is also the first game in the franchise to support online play, via the Nintendo Wi-Fi Connection and offer the ability for players to construct their own original stages. Brawl also features compatibility with four kinds of controllers (the Wii Remote on its side, the Wii Remote and Nunchuk combination, the Classic Controller, and the Nintendo GameCube controller), while its predecessors only used the one controller designed for that system. The player also has the ability to change the configuration of controls and the controller type. Super Smash Bros. Brawl features a new Adventure Mode titled Super Smash Bros. Brawl: The Subspace Emissary. This mode features unique character storylines along with numerous side scrolling levels and multiple bosses to fight, as well as CG cut scenes explaining the storyline. The Subspace Emissary features a new group of antagonists called the Subspace Army, who are led by the Ancient Minister. Some of these enemy characters appeared in previous Nintendo video games, such as Petey Piranha from the Mario series and a squadron of R.O.B.s based on classic Nintendo hardware. The Subspace Emissary also boasts a number of original enemies, such as the Roader, a robotic unicycle; the Bytan, a one-eyed ball-like creature which can replicate itself if left alone; and the Primid, enemies that come in many variations. Though primarily a single-player mode, The Subspace Emissary allows for cooperative multiplayer. There are five difficulty levels for each stage, and there is a method of increasing characters' powers during the game. This is done by placing collected stickers onto the bottom of a character's trophy between stages to improve various aspects of a fighter.