Sonic the Hedgehog (2013 game)/Hidden content

Unused artwork

Various unused sprites found through debug or other methods.[1]

Special Stage art

Artwork	Name	Description
	"Zone" Icons	1-6 can be found in the original game but the 7 is new. Meant to mark which special stage the player was currently in.
	1-up Icon	The Sonic 1-up icon was in the original game but the Tails and Knuckles ones are new. Fully functional and disappear like a ring when touched.
	"W" Icon	Not a new item and acts like a solid block when placed.

Unused monitors

Artwork	Name	Description
	Eggman monitor	Causes the player to take damage when the monitor is broken. Was present in the original game but was not fully functional.
	Goggles monitor	Adds the unused goggle sprites from the previous version of Sonic 1 and increases the amount of time the player can spend underwater.
	"S" monitor	Not a new monitor but functional in this version. Causes the player to become "Super".
	Spike monitor	New monitor that toggles the spike damage behavior when the monitor is broken.
	Three Shields monitor	May toggle the elemental shields option.
	Emerald Monitor	May toggle the max Emerald count. Sonic Triple Trouble is the first game to include a Emerald monitor.
	Unknown	Either an exclamation point or the shrink powerup from Knuckles' Chaotix. Not used in debug mode.

Zone-specific art

Artwork	Zone	Description
	Green Hill Zone	Was present in the original version but is functional now. It can destroy walls or enemies that come in contact with it while it is in movement.
	Green Hill Zone	A rather famous unused badnik, he is programmed into the game but as a secret. His coloring seems to be based on the trading cards. When placed with debug, it will hop around the area it was placed, or in a set direction.
	Marble Zone	Spikes which move horizontally.
	Marble Zone	When placed in debug mode, UFO's will appear in the sky. These were seen in promotional pictures and footage for the game.
	Labyrinth Zone	Goggles will be added to Sonic's sprite if this monitor is broken. They increase the amount of time he can spend underwater without needing air.
	Final Zone	The left image shows the back of Robotnik’s legs, which can’t be seen normally. The right image is what is normally seen.

Other

Artwork	Description
	These are leftover Tails life icons from the 2011 Sonic CD port.
	Leftover Sonic life icon from the 2011 Sonic CD port, present among the HUD sprites.
	Likely related to Retro SDK's level editor which is used to create the game. The same icon was found in the Sonic CD port.

Hidden Japanese Credits

Too view the Japanese credits start a "No Save" game and choose a character. When the SEGA logo screen appears type the letters A-G-E-S in that specific order. A ring will chime if done correctly. This code will also change Tails name to "Miles" during gameplay.

The Credits translated:

Position	Person
Program	Naka Yuuji
Plan	Yasuhara Hirokazu
Design	Ooshima Naoto Ishiwatari Jina Kataoka Rieko
Sound Produce	Nakamura Masato
Sound Program	Kubota Hiroshi Makino Yukifumi