Palmtree Panic

Palmtree Panic is the first round in Sonic the Hedgehog CD. The boss of the third zone is Dr. Robotnik, piloting the EGG-HVC-001.

Present
It is a tropical region with sharp mountains and scattered waterfalls in the background. Hence the name, palm trees adorn the region, as well as star-shaped plants that seem to litter the tropic coast. Pipes run water through the area, sometimes making tiny waterfalls of their own. This round shares similarities with Green Hill Zone.

Past
The past features a more prehistoric coast as if in the BCE era, with short, purple mountains and a turquoise sky. Palm trees may even or may not share a light bulb-like feature on top. Where the star-shaped plants would be there are instead vine-like growths sprouting from the ground, presumably the early stage of the star-shaped plants.

Bad Future
The bad future has been completely mechanized. Palm trees are mechanical, but are broken down and feature an ominous red light glowing in each center. The star-shaped plants are also mechanical, but they are rusted, broken up, and share the ominous glowing that the palm trees have. The air has been polluted by smog just as the waters have been by oil.

Good Future
The good future is also mechanized but is bright, vivid, colorful, and clean. The star-shaped plants and trees are both mechanical and seem to act as water transporters. Many plants adorn the area as well, and the region seems to be entirely water-powered.

Trivia

 * In other continuities, such as Sonic the Comic, this area was known as the Palmtree Panic Zone so as to be more consistent with other similar areas.
 * With debug mode enabled, if the player goes below the boss arena after defeating the boss, 3 monitors are present, not normally obtainable, and two of them are unused. There is an extra life, the infamous "S" monitor, and a monitor with a timer on it- the "S" gives Sonic invincibility and super speed, and the timer freezes time and all objects for a few seconds, similar to Team Dark's Team Blast in Sonic Heroes.
 * As with every other stage, the US and Japanese music for the past is the same track.
 * Palmtree Panic, like many Mega Drive-era Sonic game first levels, is reminiscent of Green Hill Zone.
 * The music that plays in this zone in the Bad Future (Japanese) is remixed for one of the boss battle music tracks in Sonic Chronicles: The Dark Brotherhood.
 * In Sonic & Sega All-Stars Racing, the music that plays in the stage's present time can be played in the Seaside Hill racetracks; however, it's based off of the Japanese version.
 * The same applies for on Mario & Sonic at the London 2012 Olympic Games, except 'Present' isn't in the name.
 * The JP music of this round returns as an unlockable track in Sonic Generations, where it is listed as PalmTree Panic.