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GameCube |genre = Platformer, action-adventure, multi-directional shooter |modes = Single-player, multiplayer |platforms = Dreamcast, GameCube }} is a video game developed by Sonic Team USA and published by Sega for the Dreamcast as part of the ''Sonic the Hedgehog'' series. It was released in June 2001 as the last ''Sonic'' game for a Sega console after the company decided to quit the console business for good. A port for the Nintendo GameCube, ''Sonic Adventure 2 Battle'', was first released in Japan in December 2001 with new content. The game was later released digitally for the PlayStation 3, Xbox 360, and Microsoft Windows in 2012. The sequel to ''Sonic Adventure'', ''Adventure 2'' features two good-vs.-evil stories: a hero story of Sonic the Hedgehog, Miles "Tails" Prower and Knuckles the Echidna as they attempt to save the world, and a dark story following Shadow the Hedgehog, Doctor Eggman and Rouge the Bat in their attempt to conquer it. The stories are divided into three gameplay styles: traditional, fast-paced platforming for Sonic and Shadow; multi-directional shooting for Tails and Eggman, and action-exploration for Knuckles and Rouge. The game also includes an extensive Chao-raising system. ''Sonic Adventure 2'' was announced in October 1999 and exhibited at E3 2000. The game's development took 18 months, and it was designed to be faster-paced and more action-oriented than the original ''Adventure''. Its scenery was influenced by U.S. locations such as San Francisco and Yosemite National Park. ''Adventure 2'' received critical acclaim, with critics praising its gameplay variety, visuals and music but criticizing its camera, voice acting and plot. Although critical enthusiasm had waned by the release of ''Battle'', this version sold over 1.44 million copies and the game as a whole has received a number of accolades. ==Gameplay== ''Sonic Adventure 2'' is a 3D game with six playable characters, divided into two campaigns: Hero (with Sonic, Tails and Knuckles, where the player battles to save the world) and Dark (with Shadow, Eggman and Rouge, where they battle to conquer it). Each character on each side has a playing style similar to the other characters on the side. The player moves through the Hero and Dark campaigns, switching between them at will. Each campaign cycles through levels of its three characters, telling different sides of the story. Levels have a variety of themes (such as cities, jungles, desert pyramids and outer space), with some followed by boss fights. Completing both the Hero and Dark campaigns unlocks a Last Story with all six characters, culminating in a final boss fight.〔 Sonic and Shadow play fast-paced levels, emphasizing platforming and gameplay.〔 Their homing attack can lock onto robots created by Eggman and G.U.N., and they can grind on rails. Tails' and Eggman's levels are slower and oriented towards multi-directional shooting; they are confined to mechs in which they can jump short heights, hover and shoot enemies. Knuckles' and Rouge's levels are open and feature action-adventure gameplay with treasure hunting; in each level, they must find three shards of the Master Emerald. Their search is guided by radar and puzzle-based clues from harmless robots.〔 Knuckles and Rouge can glide, defeat enemies with punches and kicks〔 and scale walls, digging into them to find power-ups.〔''Sonic Adventure 2'' (Dreamcast) instruction manual, pp. 12–13.〕 ''Adventure 2'' has the health system found in many other ''Sonic'' games. The player collects rings scattered throughout the levels; being hit by an enemy while holding rings causes the player to drop them all, while being hit without rings causes them to lose a life. Tails and Eggman have the customary health bar, which is slowly refilled by collecting rings. Dying with no lives results in a game over screen.〔''Sonic Adventure 2'' (Dreamcast) instruction manual, p. 19.〕 The characters are aided by occasional upgrades; in one, Sonic and Shadow can bounce up and down to reach higher areas and in another, Knuckles and Rouge can kick powerfully enough to break certain containers.〔''Sonic Adventure 2'' (Dreamcast) instruction manual, p. 21.〕 Chaos Drives can be used with the player's Chao (small, anthropomorphic animals).〔''Sonic Adventure 2'' (Dreamcast) instruction manual, p. 28.〕 Separate from the main campaigns, the player can raise Chao as virtual pets.〔 They have five attributes (Swim, Fly, Run, Power and Stamina) and a moral continuum from Hero to Dark. From the moment they hatch their stats can be increased with Chaos Drives, empowering them to compete in karate and racing minigames.〔 Their alignment gradually changes, based on their affection for a characters; for example, a Chao which likes Tails will gradually become more heroic. Playing with Chao increases affection, and when a Chao becomes fully Hero or Dark it assumes that form permanently. Although Chao eventually die, if they received enough affection during their lives they reincarnate. ''Adventure 2'' has 180 emblems, earned for a variety of tasks.〔''Sonic Adventure 2'' (Dreamcast) instruction manual, p. 26.〕 Each level has five missions; only the first is required to continue the campaign, and other missions include completing a harder version of a level and collecting 100 rings. The player earns emblems by completing missions and other tasks, many related to Chao raising. Collecting all the emblems unlocks a 3D version of the Green Hill Zone from the original ''Sonic the Hedgehog''. The game has several two-player modes. Players may race on foot through new (or altered) levels, have shoot-'em-up battles in mechs,〔 hunt for Master Emerald shards〔''Sonic Adventure 2'' (Dreamcast) instruction manual, p. 23.〕 or race in go-karts.〔 A few characters are playable in these modes, but not in the main game; Tikal and Chaos from the original ''Sonic Adventure'' is playable in the treasure-hunting game,〔''Sonic Adventure 2: Battle'' (GameCube) instruction manual, p. 15.〕 as are Amy and Metal Sonic in the foot-racing levels.〔''Sonic Adventure 2: Battle'' (GameCube) instruction manual, p. 11.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sonic Adventure 2」の詳細全文を読む スポンサード リンク
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