S

S is one of Monitor power-ups. Unlike many other power-ups, Monitors with S on it aren't featured normally in-game and are seen in earlier Sonic titles for Sega Genesis. Because of this, the player is able to find them only after activating the Debug Mode. It also noticeable that Monitors with S on it don't usually work in several games while they are discovered as unused content of the game. Most of the time, by braking this Monitor will give automatically ability to do Super transformation.

Description
Technically, Monitors with S are first seen in Sonic the Hedgehog 3, where the player has to activate the Debug Mode. When the player inserts empty monitor to the zone, it apparently turns out to be Monitor with S on it. With playing as Sonic, after braking the Monitor, the player will get automatically 50 Rings to the hand and the player will transforms into Super Sonic without collecting any Chaos Emeralds from Special Stages. If the player does this while playing as Tails, the transforms varies, even glitching sprites of the playable character, as Tails is not invented to have Super form in the game. In locked on version of Sonic the Hedgehog 3 & Knuckles, Monitors with S are able to find by using Debug Mode similarly. By braking it, it will automatically turn Sonic and Knuckles to Hyper Sonic and Hyper Knuckles, while Tails is able to turn into Super Tails. All of them also get 50 rings as well.

However even in earlier games these Monitors are seen to be used, but have become unused and are dropped during the game's development. In original 16-bit version of Sonic the Hedgehog, unused sprites of monitors with S on it are discovered. According the issue of Computer & Video Games, the player would be able to special power-up, which could have both Invincibility and Speed Sneakers power-ups at once. This would lead the possibility, that the S power-up would be featured fully functionally at some point during the development. The same power-up is years later is used in 2013 re-release of original Sonic the Hedgehog, where it can be found by using the Debug Mode, while it can also easily make the playable character transform into Super form.

One of earlier prototypes of Sonic the Hedgehog CD titled "Prototype 510" has also Monitors with S on it, which are identical to unused ones from original Sonic the Hedgehog. These Monitors are seen normally lying around playable zones of the game, as the player breaks these, it will increase the speed and gives invincibility, like Computer & Video Games issue apparently stated.