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Sonic Adventure 2 is a platform game developed by Sonic Team USA and published by Sega in 2001 as a part of the Sonic the Hedgehog series.

Sonic Adventure 2 is a sequel of Sonic Adventure. It is also the only game where Sonic wears Soap shoes to promote the product. There were also many billboards in the game that promoted the shoes.

It was released in North America on June 5, 2001 and in Japan and Europe on June 23, 2001 to mark the 10th anniversary of the release of the original Sonic the Hedgehog. This game introduces two new playable characters, Shadow the Hedgehog and Rouge the Bat, and is also one of the few Sonic games to officially feature Doctor Eggman as a playable character. On December 10, 2001, a port of the game called Sonic Adventure 2 Battle was released onto the Nintendo GameCube in Japan, followed by North America on February 12, 2002 and Europe on May 3, 2002.

Single player

Gameplay takes place between two parallel storylines, the "Hero" story and the "Dark" story; the player has the option of advancing in either one or the other at any time. The "Hero" story featuring Sonic, Knuckles, Tails and the non-playable Amy, while the "Dark" story featuring Shadow, Rouge, and Dr. Eggman. Each hero character plays similarly to their respective dark character, and vice versa. Levels advance in order for each storyline, alternating between each of the playable characters.

Levels featuring Sonic or Shadow are designed in much the same way as they were in Sonic's levels in Sonic Adventure,[1] wherein the player's primary objective is simply to get to the end of the level. Levels with Tails or Dr. Eggman allow the player to control a mechanized robot walker and generally blast their way to the end, much like E-102 Gamma's stages in Sonic Adventure. Knuckles and Rouge are required to scour their levels for shards of the Master Emerald (with the exception of 2 stages where they must find keys into Eggman's base and 1 stage where chaos emeralds are located), again, much like Sonic Adventure. Interspersed between the levels are various bosses, which one particular character must fight.

Within Action Stages, players collect rings and defeat enemies, with a timer counting the time spent within the level. At the end of each stage, the player is given a score based on the number or rings collected and time spent within the level. The more rings and less time, the higher the score is. The player is also given a rank-based performance, a letter grade that is either A, B, C, D, or E, with A being the highest and E being the lowest. Irrelevant to any other factors, an A Rank is automatically awarded to players that complete any score-ranked mission with all of the rings from that level in the player's possession.

There are five missions within each Action Stage; in order to obtain the second mission, the player must complete the first one, to unlock the third, the second mission must be finished, and so on. In order from first through third, the missions are to complete the level, collect 100 rings, find a "lost Chao" using the Mystic Melody upgrade, finish within a time limit, and complete a "Hard mode" version of the Action Stage.

Emblems are also given within the game; there are 180 Emblems in total. In order to gain all 180 Emblems, players must defeat every mission within every stage, achieve an A rank in all stages and missions, et cetera. After collecting all 180 Emblems the player unlocks an extra level 3-D Green Hill level. 3-D Green Hill is a remake of Green Hill Zone from the original Sonic the Hedgehog game.

[edit] Two-player mode

There are some characters that can only be played on two-player mode. These include, Amy Rose, Metal Sonic, Tikal the Echidna, Chaos, Chao, Dark Chao (Nintendo GameCube only), EggRobo (Kart Racing), and Big the Cat (Dreamcast only). However, using Action Replay these characters can be playable in single player mode.

A multitude of levels from single player are playable. The levels playable in two player mode are mostly the same as the normal game; Sonic, Shadow, Amy and Metal Sonic race, Tails, Eggman, Chao and Dark Chao(or Big) have a shootout, and Knuckles, Rouge, Tikal and Chaos hunt for emerald shards.