Although this article is based on official information, the actual name of the article's subject is pure conjecture.
Rotating platforms are small platform gimmicks that appear in the Sonic the Hedgehog series. They spin around themselves in certain intervals, knocking down any playable character standing on them.
The rotating platforms are rather small floating platforms that start spinning around clockwise in certain intervals; after having spun around for a few seconds, the rotating platforms will stop moving and lie vertically for few seconds, allowing the playable character to stand on them, before starting to spin again, repeating the pattern. They are usually featured in industrial-themedZones.
When a player is standing on a rotating platform with his/hers playable character, the player's playable character will be knocked down from the rotating platform once it starts to spin. Unlike regular platforms, the player is unable to jump below rotating platforms when they stop spinning in mid-air, meaning that the player has to jump at the right time when these platforms are rotate around once. Because of this, jumping on rotating platforms are really tricky, as some of them can spin at the same time while other can be spinning at a different time.
Sonic the Hedgehog (1991)
The rotating platforms were first seen in the original Sonic the Hedgehog, where they are featured in Scrap Brain Zone and are yellow, blue, and grey colored. Besides the standard floating rotating platforms, the Scrap Brain Zone also features rotating platforms attached to moving chain loops, which stand still when moving forward on top of the chain loop, but will start spinning constantly once they move backward on the bottom of the chain loop.
Scrap Brain Zone Act 2 also features an infamous rotating platform pit; once the player has fallen into this "pit" he will have to jump through a group of rotating platforms that move at the same time. Although this seems easy, it also requires calculated jumps; if Sonic takes too long to jump, he will fall at the beginning; if he jumps early he will also fall as the platforms may stop spinning and are solid there.
Sonic the Hedgehog CD
In Sonic the Hedgehog CD, rotating platforms are featured in Metallic Madness, though they are colored dark blue instead of yellow-blue-grey as they were in Sonic the Hedgehog. Here, Metallic Madness features both regular rotating platforms and rotating platforms on chains, both of which function similarly to those in Scrap Brain Zone.
In Sonic Advance 2, rotating platforms are featured as attachments to the Egg-Go-Round, where they are two grey-colored platform. In this battle, whenever the Egg-Go-Round is about to make a rotating platform spin for a couple of seconds, the orb in the middle of the rotating platforms will turn red.
In Sonic the Hedgehog 4: Episode I, there exist similar type of platforms in Mad Gear Zone Act 3, which functions differently from the rotating platforms. For these platforms, the player uses D-pad or joystick to incline the platform left or right, when Sonic is using the Spin Attack on them and curls into the incline direction.