Sonic the Hedgehog 2 (2013)/Hidden content

Unused monitors

Unused monitors and various objects.[1]

Artwork	Name	Description
	"S" monitor	Causes the player to become Super. Using this monitor is the only way for Tails to become Super in this game.
	Three Shields monitor	Switches the Items option on or off. Changes take effect either when the act is restarted or when the next act is reached.
	Emerald Monitor	Breaking the monitor will give the player all the Chaos Emeralds, or take them all away.
	Spring Monitor	This monitor isn't present in debug mode. It also exists in the Nick Arcade and Simon Wai prototypes.

Zone-Specific Sprites

Artwork	Zone	Description
	Emerald Hill Zone	The snail badnik from the Nick Arcade prototype has the same movement pattern as it does in the prototype.
	Emerald Hill Zone	A alternate version of the Buzzer badnik. It behaves as it was planned out to in concept art. It's shots burn bridges, which will harm the player unless they have a fire shield.
	Chemical Plant Zone	Another beta badnik, it now works fully. It moves around slowly but speeds up if it comes in close proximity with the player. It drops Bubblers as it's attack.
	Chemical Plant Zone	Dropped by Mother Bubble badnik and explodes after touching the ground.
	Chemical Plant Zone	Unknown object.
	Chemical Plant Zone	A stationary fireball that harms the player, unless they are wearing a Fire Shield.
	Chemical Plant Zone	A ball that will float in the air, and give chase if the player is in close proximity. When above the player's head, it'll explode and drop chemicals. The Bubble Shield can protect against this attack.
	Chemical Plant Zone	Still unused.
	Aquatic Ruin Zone	Closes as soon as the player passes through it.
	Aquatic Ruin Zone	Same as Grounder, but green. A homage to Adventures of Sonic the Hedgehog.
	Aquatic Ruin Zone	Pillar found in ARZ's sprite sheets.
File:Sonic2iOS-MRZObject.png	Mystic Cave Zone	Weird platform made of rings, placeable using debug mode. It moves back and forth depending on which side you stand on.
	Oil Ocean Zone	Checkered ball that behaves like the checkered ball in the Sonic 1 2013 game, rather than how it did in the 16-bit version.
	Sky Chase Zone	A standing frame for the Balkiry.
	Sky Chase Zone	Walking animation for the turtle.
	Wing Fortress Zone	Platform that shoots laser when it spins.
	Wing Fortress Zone	Same as original game and hurts player.

Miscellaneous Sprites

Artwork	Zone	Description
	Unknown	Continue screen animation from Sonic 1 (2013 game).
	Unknown	These are leftover Tails life icons from the 2011 Sonic CD and Sonic 1 port.
	Unknown	Likely related to Retro SDK's level editor which is used to create the game. The same icon was found in the Sonic CD and Sonic 1 port.

Egg Gauntlet Zone

Egg Gauntlet Zone data remains in the final game but can only be accessed through hacking. It was the first attempt at a Boss Attack level that had some original artwork such as mechanical palm trees and flashing lights. It was to be a full Zone that acted as a testing facility for some of the bosses inventions rather than just have a level with bosses back to back. The act was nearly completed and needed just a few graphical changes to replace missing, unpolished, and placeholder graphics. Sonic Team did not approve of changing the location, colors, or graphical style so the level was scrapped and the Boss Attack level that was used in the final game was created.[2] A map of the level can be seen here.