Green Hill Zone

Green Hill Zone (also known as Green Hill) is an area on South Island and is the first level in the game Sonic the Hedgehog. Throughout the Sonic the Hedgehog series it has made numerous appearances in many games, including Sonic Adventure 2, Sonic Battle and Sonic Generations. In other games in the series, various levels including Emerald Hill Zone from Sonic the Hedgehog 2 and Seaside Hill from Sonic Heroes are based off Green Hill Zone, having the same kind of green grass and checkered soil.

In the "Gallery" section of Mario & Sonic at the Olympic Games, one of the two backgrounds for the Count Master mini-game is Green Hill Zone; it appears in the second, fourth and final levels. The background music of the Green Hill Zone can optionally be heard in the game, once it has been unlocked.

Green Hill Zone also appears in Super Smash Bros. Brawl as a unlockable stage. It is automatically unlocked when the player unlocks Sonic the Hedgehog. In the stage background, Miles "Tails" Prower, Knuckles the Echidna, and Silver the Hedgehog often appear running around the loop. If the terrain is attacked too often, a section of it will collapse, but it can eventually repair itself. A checkpoint from the Sonic games occasionally appears on the stage, which temporarily spins when attacked and can deal damage to opponents. This stage is also set to be featured as a returning stage in Super Smash Bros. for Nintendo 3DS.

Green Hill Zone appears in Mario & Sonic at the Olympic Winter Games as the background in Dream Figure Skating for the first act of Sonic's world. It reappears as the setting for Hole-In-One Curling in Mario & Sonic at the Sochi 2014 Olympic Winter Games more closely resembling its appearance in Sonic Generations, though the default music track is Splash Hill Zone from Sonic the Hedgehog 4: Episode I.