Green Hill Zone - SmashWiki, the Super Smash Bros. wiki

Green Hill Zone is the stage that represents Sonic the Hedgehog in Super Smash Bros. Brawl, Super Smash Bros. for Nintendo 3DS, and Super Smash Bros. Ultimate. It is unlocked after Sonic himself is unlocked in Brawl but is available from the start in subsequent games. In

Green Hill Zone, Smashpedia

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Green Hill Zone - SmashWiki, the Super Smash Bros. wiki