Sonic Adventure DX

Sonic Adventure (ソニックアドベンチャー Sonikku Adobenchā?) is a platform video game developed by Sonic Team and published by Sega. It was originally released for the Dreamcast as a launch title in Japan in 1998, and worldwide in 1999. It was the first game in the main Sonic the Hedgehog series since Sonic & Knuckles in 1994, and was the best-selling game on the Dreamcast.

After series villain Doctor Eggman releases an ancient monster, protagonist Sonic the Hedgehog vows to stop him collecting the Chaos Emeralds. The other playable characters are flying fox Miles "Tails" Prower, love interest Amy Rose, Knuckles the Echidna, who plans to reassemble the Master Emerald, angler Big the Cat, and E-102 Gamma, one of Eggman's robots.

Sonic Adventure received generally positive reviews for its graphics, gameplay, and soundtrack. It became the best-selling Dreamcast game.

In 2003, an enhanced port was released for the GameCube and Windows titled Sonic Adventure DX: Director's Cut (ソニックアドベンチャー デラックス Sonikku Adobenchā Derakkusu?). Sonic Adventure DX includes a Mission Mode, which included 60 missions to complete throughout the Adventure Fields and Action Stages. It also contains an unlockable compilation that features twelve Game Gear games featuring Sonic and friends. They are Sonic Drift, Sonic Chaos, Sonic Labyrinth, Sonic the Hedgehog: Triple Trouble, Sonic Drift 2, Tails' Skypatrol, Sonic Blast, Tails Adventure, and the 8-bit versions of Sonic the Hedgehog, Sonic the Hedgehog 2, Sonic the Hedgehog Spinball, and Dr. Robotnik's Mean Bean Machine. Also, if all Emblems are collected, then the player can play as Metal Sonic. Reviews were generally less positive than those of its Dreamcast predecessor.