(or simply Green Hill) is the first level of the platform game Sonic the Hedgehog, which released for the Sega Genesis in 1991. The level is grassy and lush, with environmental features such as palm trees, vertical loops and cliffs, and is the home of numerous forest animals. Like the game's other levels, Green Hill comprises 3 acts; in the third, Sonic fights antagonist Doctor Eggman before moving to the second level, Marble Zone. It was constructed by level designer Hirokazu Yasuhara with its musical theme by Masato Nakamura. Green Hill Zone is considered to be a video game classic; the level and its music have also received positive opinions from critics. It has appeared in other games in the series, such as Sonic Adventure 2, Sonic Generations, Sonic Mania, and Sonic Forces. Critics have noted a Green Hill-like aesthetic in levels of other games. History Green Hill is the first level of Sonic the Hedgehog. Located on South Island, it is a lush, grassy stage with unique features like droopy palm trees and crumbling cliffs. In addition, as with later levels in the game, Green Hill has environmental features and obstacles like ramps, vertical loops, tunnels, spring-boards, spikes, and checkpoints. It is normally populated by woodland creatures, but antagonist Doctor Eggman imprisons them inside robots known as Badniks prior to the events of the game, so the player must destroy them to free the animals. Green Hill consists of three acts, and the end of Act 3 features a boss battle with Robotnik. After beating Robotnik, Sonic moves on to the second level, the lava-themed Marble Zone. Sonic the Hedgehog was created by the newly formed Sonic Team, a 15-member Sega subsidiary formed to create a character that could compete with Nintendo's Mario. The game's level design was handled by Hirokazu Yasuhara, and the musical theme was composed by Masato Nakamura from the Japanese band Dreams Come True. In designing Green Hill, Yasuhara was inspired by the U.S. state of California, while the game's color scheme in general was influenced by the work of pop artist Eizin Suzuki. While the original game was a 2D side-scroller, Green Hill was remade in full 3D as a secret level in the 2001 game Sonic Adventure 2; the player unlocks it after collecting all 180 of the emblems found by completing the game's many objectives. The 2011 game Sonic Generations, a title