This article pertains to the beta elements of Sonic the Hedgehog (1991).

MonitorsEdit

Artwork	Name	Description
	Robotnik monitor	Does nothing. This monitor was likely intended to hurt the player, as it does in Sonic 2.
	Goggles monitor	Does nothing. This monitor was most likely accompanied by the unused goggle graphics. This may have provided the ability to breathe underwater.
	Static monitor	Does nothing. This monitor can be found in some parts of Scrap Brain Zone and can be broken by clipping through the walls.
	"S" monitor	Does nothing. This monitor also appears in Sonic CD prototype 510, where it grants the player extra speed and invincibility. This is most likely the intended function of the monitor here, as a Computer & Video Games issue alludes to a powerup which grants extra speed and invincibility. A similar version exists in Sonic 3 & Knuckles which makes Sonic hyper.

Special Stage IconsEdit

Note: All of these items can be seen in-game by using the debug mode to fall outside the playing area of the special stage. It is easier to see them when advancing frame-by-frame by pausing and pressing C.

Artwork	Name	Description
	"Zone" Icons	Found in the object list for the special stages with their graphics in the ROM, these unused special stage icons have no known use. They are labeled as Zones 1-6, suggesting that they may have warped Sonic to another Zone from the special stage as some kind of shortcut. They are solid, like normal blocks.
	"1-up" Icon	An extra-life icon for the special stages. It is listed in the manual for the game, but it never actually appears. It is, however, fully functional, and can be placed in any special stage. The icon disappears when touched, like a ring.
	"W" Icon	An icon with the letter W on it. Its use is unknown, and it has no function when placed in-game. It is solid, like a normal block.

Unused Sonic SpritesEdit

Artwork	Description
	This sprite shows Sonic standing while gasping for air. This was presumably intended to be used in Labyrinth Zone.
	This animation shows Sonic holding his breath while running. This may have been used during the countdown to signify Sonic is running out of air.
	This unused sliding sprite is similar to the one used in Sonic CD's Wacky Workbench Zone.
	As seen in a couple of prototype screenshots in magazines, Sonic appears to be striking a victory pose after passing the signpost.
	These sprites, reminiscent of the Spin Dash, are present in the final ROM, but their use is unknown. Some theories are that they were used for a move similar to the Spin Dash or that they were intended for some sort of warp movement, perhaps through winding tunnels. It's also possible that a teleporter (like the one found in the 8-bit version of Scrap Brain Zone) would have played the animation.
	This set of sprites showing Sonic shrinking are not used in the game. While their intended use is unknown, they could have been used to simulate the death animation for falling. They may have also been used for a "speed tunnel" that would extend into the background.