Sonic the Hedgehog 2 (alpha)/Hidden content

Back to: Sonic the Hedgehog 2 (alpha).

Level select

Enabled by default. Simply press + on the title screen.

Edit mode

Press then + on the title screen, then highlight a Zone in the stage select and press and hold .

2-Player VS mode

Highlight a Zone in the stage select and press + to play the level in 2-player split-screen mode. This does not work on levels with water in them.

Night mode

Enable Edit Mode, highlight a Zone in the stage select and press +.

Unused content

Art

	Description
	An early design for the moving blocks in Casino Night Zone, which is much smaller than in the final game.

Objects

Placeable in edit mode

	Description
	The ? monitor, destined for 2P versus mode can be placed, and when broken, Sonic will transform into Super Sonic.
	The prototype Star Post seen in earlier versions of the game still exists. When deactivated, it is yellow, rapidly flashing white and red once Sonic has passed by.
	The diagonal lifts still exist in Metropolis Zone, except unlike the Simon Wai prototype, they do not move.
	Slicer with a blue palette can be placed in Metropolis Zone.
	Stegway with an incorrect palette can be placed in Hidden Palace Zone.
	Horizontal versions of the breakable tube-like objects in Oil Ocean exist. They function in the same way as the final game, but send Sonic and Tails left or right rather than up. Once Sonic is travelling, the player can't make him stop unless he collides with an object - even in edit mode the player will continue to travel.
	Fully functional horizontal and vertical fans exist in Oil Ocean Zone.
	The auto-rolling object, usually found before tubes to force Sonic and Tails into a ball, can be placed in Casino Night Zone. It is represented in edit mode as four spring icons, which are not used in any other version of the game.
	Bumpers can also be placed in Casino Night Zone.
	Doors for Chemical Plant Zone, with the correct artwork. Also unused in the final game, but used in the 2013 remake.
	Both horizontal and vertical variants of the Spiny enemy for Chemical Plant Zone.
	Grabber enemy for Chemical Plant Zone. It will release an animal if destroyed, but it doesn't move yet.
	Unused doors for Aquatic Ruin Zone. They're unused in the final game too, but here they are just solid objects.
	Chop Chop enemies for Aquatic Ruin Zone.
	Whisp enemies for Aquatic Ruin Zone.
	Grounder enemies for Aquatic Ruin Zone.
	Bubble object for Aquatic Ruin Zone.
	"Growing" pillars.
	Pillars where the bottom drops off when Sonic and Tails run beneath.
	Pillars that fall down when stood on.

Unplaceable

	Description
	Though the Snail Badnik was replaced with Coconuts, its coding hasn't been dummied out yet. Interestingly, its object ID was changed from $54 to $59.
	An early version of the Crawl Badnik, whose object ID is $5A. This Badnik has different behaviour from the final, where it will burrow out from underground, much like in early concept art by Tom Payne. The mappings for this were made for the old art, but this prototype has newer art that doesn't match the mappings. Interestingly, the part of the badnik that is destroyed is the dirt it burrows out of, and not the badnik itself.