Rotating platform

Rotating Platforms are small gimmicks, which have been featured for the most part in industrial themed Zones. These smaller, floating platforms start spinning around clockwise once and stops for few seconds to repeat it's rotating pattern. Rotating platforms have only made appearances in the original 16-bit version of Sonic the Hedgehog and Sonic CD.

Description
First seen in original Sonic the Hedgehog, rotating platforms are seen featured in Scrap Brain Zone. Unlike regular platforms, the player is unable to jump below them, when they stop rotating in mid-air and thus he/she has to jump in right time, when they are rotate around once. When the player is on the platform, he/she will fall eventually back down once the platform starts rotating again. This makes the jumping on them really tricky, as some of rotating platforms can spin at the same time or some of rotate in different time. In Scrap Brain Zone, there are also rotating platforms in moving chains, that stand still on top of chain, but will start rotating once chain turns down back.

In Sonic CD, rotating platforms are featured in Metallic Madness, where they function similarly like in Scrap Brain Zone. They are however more dark blue colored, instead of yellow-blue-grey colored ones at previous game. Metallic Madness also has rotating platforms on chains as well.

Trivia

 * Despite having the concept art (see image above right), rotating platforms have never made into Sonic the Hedgehog 4: Episode I and thus being dropped at some point of the game's development.