Lets not forget about our first encounter with the devilish creations of Sonic's nemesis, Dr. Robotnik. There are five different badniks that are home to the Green Hill Zone including some of the most infamous machines in the Eggman catalogue, who would later encourage development of wave after wave of similar models in the later games. Remember, take out these guys by jumping or rolling into them, but you'll take damage if you touch them while you aren't in a spinning ball. Buzz Bombers are the classic wasp robot that zip from one area to another in the air, pausing only to try and shoot a small yellow projectile at you from its stinger. Probably the most basic badnik of them all, Moto-bug simply moves back and forth over a set area along the ground. Choppers, the fish badniks, leap up and down at you from waterfalls as you're crossing the bridges, while Crabmeats prefer a stationary ground-based assault. Beware of the projectiles that are occasionally thrown from their claws as they stagger around rather curiously, and watch out for the Newtrons, the masters of stealth. The red type will typically appear behind you and take the form of a missile that blasts along the ground towards you, while the more subtle green ones hide on the rocks, sneakily throwing a beam at you before disappearing again, and because of their positioning, they cannot be destroyed.

- In 2006, for Sonic's 15th anniversary, official Japanese website the Sonic Channel showed off a Green Hill Zone papercraft, printable pdf sheets that could be cut up and folded to create a range of Green Hill themed objects. I still have mine somewhere, still mostly held together last time I checked, surprisingly. Want to give it a try?