Sonic the Hedgehog (2013 game)/Hidden content

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Level select

Start a "No Save" game with any character, and on the Sega screen, tap the letters S-E-G-A in order once the entire logo appears. A Ring sound will confirm correct entry. Then hold two fingers on the bottom of the screen and wait. Once the game reaches the title screen, it will immediately go to the level select screen. Alternatively, if using a controller, press on the title screen in "No Save" mode.

Several options are listed on this screen, and are as follows:

• Player: Choose any of the available characters/character teams. The values are:
  • 00 - Sonic & Tails
  • 01 - Sonic
  • 02 - Tails
  • 03 - Knuckles
• Spindash: Toggles the Spin Dash, just like in the Settings menu.
• Gnd Spd Cap: Toggles the ground speed cap from the original game. Turned off by default.
• Air Spd Cap: Toggles the air speed cap from the original game. Turned off by default.
• S1 Spikes: Toggles the Spike damage behaviour from the original game. Turned off by default.
• Items: Choose between "S1", "S1+S3", "S2" and "S2+S3". Values with "S2" will change the graphics of the Shield and Invincibility items to those of Sonic 2. Values with "S3" will add in the elemental Shields and allow Sonic to perform the Insta-Shield from Sonic 3.
• Max Emeralds: Toggles between 6 or 7 Chaos Emeralds. Setting this to 7 allows characters to collect a seventh Chaos Emerald (cyan) and change into their Super forms after getting 50 Rings and double-tapping the Jump button. This also changes the palette of the Emeralds to match the modern colours.

Debug mode

Play sounds 01, 09, 09, 01, 00, 06, 02, 03 (the US release date of the original game) in the Sound Test, then select any level.

During gameplay, tap the HUD at the top left corner of the screen to activate Debug mode. While in Debug mode, tap - or + at the top of the screen to cycle through items, and press the Jump button to place an item.

All Chaos Emeralds

Play sounds 04, 01, 02, 06 in the Sound Test. A Chaos Emerald sound effect will confirm correct entry. This immediately gives the player all of the Chaos Emeralds.

Hidden Japanese credits / Swap "Tails" for "Miles"

To 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. Alternatively, if using a controller, press on the title screen in "No Save" mode. A Ring will chime if done correctly. This code will also change Tails name to "Miles" during gameplay.

The credits translated:

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

8th Special Stage / Special Stage Editor

Enable level select and Debug mode, then play sound 07 in the Sound Test and select Special Stage. This will load a unique "CUSTOM" Special Stage that can be edited with Debug mode through new "Load", "Save" and "Clear" icons. The created Special Stage will not be saved between game sessions.

Unused content

Art

Various unused sprites found through debug or other methods.

Special Stage art

Art	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.
	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

Art	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. Toggles the spike damage behaviour 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.
	Either an exclamation point or the shrink powerup from Chaotix. Not used in debug mode.

Zone-specific art

Art	Description
	Green Hill Zone giant ball. 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.
	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.
	Spikes which move horizontally in Marble Zone.
	When placed in debug mode, UFOs will appear in the sky of Marble Zone. These were seen in promotional pictures and footage for the game.
	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.
	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

Art	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.