SonicAdventure 2[a] is a 2001 platform game developed by Sonic Team USA and published by Sega for the Dreamcast. It features two good-vs-evil stories: Sonic the Hedgehog, Miles "Tails" Prower, and Knuckles the Echidna attempt to save the world, while Shadow the Hedgehog, Doctor Eggman, and Rouge the Bat attempt to conquer it. The stories are divided into three gameplay styles: fast-paced platforming for Sonic and Shadow, multidirectional shooting for Tails and Eggman, and action-adventure exploration for Knuckles and Rouge. Like previous Sonic the Hedgehog games, the player completes levels while collecting rings and defeating enemies. Outside the main gameplay, they can interact with Chao, a virtual pet, and compete in multiplayer battles.
Sonic Adventure 2 was released in June 2001, coinciding with the franchise's tenth anniversary. It was the final Sonic game for a Sega console, released in the months after Sega discontinued the Dreamcast and transitioned to third-party development. As a result, a port for the GameCube, released later in 2001, became the first Sonic game for a Nintendo console. Adventure 2 received positive reviews, with praise for its gameplay variety, visuals, and music but criticism for its camera, voice acting, and plot. Although reviews for the GameCube port were more mixed, it sold 1.7 million copies worldwide, becoming one of the bestselling GameCube games and the bestselling third-party GameCube game. Following Adventure 2, Sonic became a multiplatform franchise, beginning with Sonic Heroes (2003).
Sonic Adventure 2 is a 3D platform game divided into two campaigns: Hero and Dark. In the Hero campaign, players control Sonic, Tails, and Knuckles, who fight to save the world; in the Dark campaign, players control Shadow the Hedgehog, Doctor Eggman and Rouge the Bat, fighting to conquer it. 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),[1] with some followed by boss fights. The two campaigns' stories occur in parallel; completing both campaigns unlocks a final story with all six characters, culminating in a final boss fight.[2]
Sonic and Shadow play fast-paced levels, emphasizing platforming.[3] Their homing attack can lock on to robots created by Eggman and GUN, and they can grind on rails. Tails's and Eggman's levels are slower and oriented towards multidirectional shooting; they are confined to mechs in which they can jump short heights, hover and shoot enemies. Knuckles's 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.[2] Knuckles and Rouge can glide, defeat enemies with punches and kicks,[3] and scale walls, digging into them to find power-ups.[4]
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 health bars, which are slowly refilled by collecting rings. Dying with no lives results in a game over screen.[5] The characters can obtain permanent upgrades that grant them new abilities; for example, one upgrade allows Sonic and Shadow to dash along a sequential trail of rings to reach distant platforms, one gives Tails and Eggman hover jets that slows their descent to cross large gaps, while another lets Knuckles and Rouge dig into the ground to uncover treasure and Master Emerald pieces.[6]
Separate from the main campaigns, the player can raise Chao as virtual pets.[2] 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 or small animals, found in the main stages, which empower them to compete in karate[7] and racing minigames.[3] Their alignment gradually changes based on their affection for the 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.[8] Although Chao eventually die, if they receive enough affection during their lives they reincarnate.[9]
Adventure 2 has 180 emblems, earned for a variety of tasks.[10] 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 stage from the original Sonic the Hedgehog.[11]
The game has several two-player modes. Players may race on foot through new (or altered) levels, have shoot-'em-up battles in mechs,[3] hunt for Master Emerald shards[12] or race in go-karts.[3] A few characters are playable in these modes, but not in the main game; Tikal and Chaos from the original Sonic Adventure are playable in the treasure-hunting game,[13] as are Amy Rose and Metal Sonic in the foot-racing levels[14] and mechs piloted by Chao and Big the Cat (replaced by a Dark Chao in Battle) in the shooting levels.[15]
Knuckles encounters Eggman and Rouge, a government spy, attempting to steal the Master Emerald. He stops them by shattering it and searches for the scattered shards to repair it. Rouge follows Eggman to the ARK, where Shadow shows Eggman the Eclipse Cannon, another weapon created by Gerald. Shadow plans to charge the cannon with the Chaos Emeralds and use it to take over the world. Rouge offers her services and gives Shadow and Eggman a Chaos Emerald to gain their trust. Tails and Amy infiltrate GUN's base and rescue Sonic, while Eggman, Shadow, and Rouge collect three emeralds and blow up GUN's base to erase their tracks. Eggman makes a global broadcast in which he threatens to destroy the planet if he is not accepted as Earth's ruler. He demonstrates the cannon's power by destroying half of the Moon. While avoiding GUN forces, Sonic, Tails, and Amy meet up with Knuckles and use a Chaos Emerald to track the others to the ARK.
Knuckles separates from the group and finishes repairing the Master Emerald. On the ARK, Tails reveals he has made a counterfeit Chaos Emerald to destroy the Eclipse Cannon. As Sonic is about to use it, Eggman captures Tails and Amy, forcing Sonic to return and rescue them. Sonic tries to trick Eggman with the fake emerald, but Eggman deduces the plan and jettisons him in an escape pod rigged with explosives. Sonic uses the power of the fake emerald to escape; Shadow is sent to intercept him. Eggman sneaks away with the last emerald and arms the Eclipse Cannon. The entire colony suddenly starts falling, and a prerecorded message from Gerald is broadcast globally: he programmed the ARK to collide with Earth if the emeralds were used, a retaliation against the government for condemning his research and killing his colleagues, including Maria. Everyone but Shadow works together to access the cannon's core and neutralize the ARK using the Master Emerald.
Amy pleads for Shadow's help, and he remembers that Maria really requested for him to help mankind. Shadow catches up with Sonic and Knuckles in the core as they encounter the Biolizard, a colossal lizard and prototype Ultimate Lifeform. Knuckles deactivates the Chaos Emeralds with the Master Emerald, but the Biolizard fuses with the cannon to continue the ARK's collision course. Sonic and Shadow use the emeralds to transform into their super forms, destroy the Biolizard, and put the ARK back into a stable orbit. This depletes Shadow's energy and he plummets to Earth, content in fulfilling his promise to Maria. The people on Earth celebrate as the group returns, and Sonic bids Shadow farewell.
Among Sonic Team's unimplemented Adventure concepts was a black hedgehog who equaled or exceeded Sonic's coolness.[20][21] The idea was revived during Adventure 2's brainstorming sessions.[21] Iizuka chose to appeal to American audiences with an antihero, a popular character archetype in the US at the time.[22] He cited the Image Comics character Spawn as an influence.[23] Sonic Team USA told Maekawa to turn the concept into a character, but he struggled until writing lines for a scene in which Sonic confronts the hedgehog for impersonating him. From here, Maekawa envisioned the hedgehog as a delicate, pure character who would refer to himself using the more humble Japanese pronoun boku (僕).[20] He was originally named Terios,[24] but was renamed Shadow after another new character, a bat, who became Rouge.[25] Sonic Team intended for Shadow to be a one-off character who would not appear in subsequent Sonic games.[24]
Iizuka summarized Sonic Adventure 2's development as "trying to make the impossible possible", as Sonic Team USA had to overcome the challenge of creating a game comparable in scope to the first Adventure with less than a tenth of the staff.[16] Despite this, he considered Adventure 2 the most fun Sonic game to develop, as the small team meant "we were able to condense all the good elements from the previous game, and deliver a story and game that was satisfying to players everywhere".[26] Due to the smaller staff, Sonic Team USA split Adventure 2 into two campaigns featuring character teams instead of Adventure's format of six starring individual characters.[16] Adventure 2 uses the same game engine, with improved texture quality and collision detection.[27]
Sonic Team designed Adventure 2 as faster and more action-oriented compared to the slower, more story-focused Adventure.[18] Whereas Sonic Team had tried to include as much content as possible in Adventure, for Adventure 2 they only concentrated on the elements they deemed necessary.[28] Iizuka noted that players who prioritized action found much of Adventure's content pointless, so for Adventure 2, Sonic Team USA sought to streamline the experience while retaining Adventure's "bulkiness".[29] They removed the hub worlds in favor of linear level progression more in line with the older Sonic games,[30] and divided action and exploration sequences among the characters rather than mixing them.[18] Each level was tailored for its character,[31] and unlike Adventure, in which some playable characters had short campaigns, all six Adventure 2 characters have roughly equal gameplay time.[18]
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