It is a simple stage with one major hard grassy-platform and three soft grassy-platforms all at the same level (about a jump's length).
The music track is the self-titled Emerald Hill Zone, the original theme that plays on the level of the same name in Sonic the Hedgehog 2, ripped straight from the original game.
Emerald Hill Zone is the name of the first level in the Sega Mega Drive/Genesis game, Sonic the Hedgehog 2. The stage carries a basic design, but it is mostly comprised by tilesets from the original game.
In the stage select screen, the thumbnail for this stage has a flat-color background, unlike the stage itself. This is a holdover from the original demo (as seen on the right), where it was a four-platformed stage with the flat-color placeholder background.
Emerald Hill Zone was the first stage programmed by Gregory McLeod as Super Smash Flash began development as a completely different game before becoming a Super Smash Bros. fangame. This explains why it is the only third-party stage in the game.