Sonic (or Knuckles) starts out the adventure in a tropical forest. Hills and valleys abound, and rickety wooden bridges cross treacherous rivers. Watch out for the piranhas and coconut-tossing monkeys!
— Description, Sonic Blast US manual
Green Hill Zone (グリーンヒル Gurīn Hiru?, lit. "Green Hill") appears in Sonic Blast. It is the first Zone of the game, which is represented by the green color and its natural-like environment, a trait shared by the first levels of the Sonic the Hedgehog series video games.