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Sonic the Hedgehog (2013)

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Title Screen

Sonic the Hedgehog

Developers: Christian Whitehead, Headcannon
Publisher: Sega
Platforms: iOS, Android
Released internationally: May 16, 2013

CopyrightIcon.png This game has hidden developer credits.
EnemyIcon.png This game has unused enemies.
ObjectIcon.png This game has unused objects.
GraphicsIcon.png This game has unused graphics.
DebugIcon.png This game has debugging material.
SoundtestIcon.png This game has a hidden sound test.
LevelSelectIcon.png This game has a hidden level select.

Finally, for once, a version of Sonic 1 that isn't a straight-up emulation, Sonic Jam and the really lackluster Game Boy Advance version aside. Powered by the fan-made Retro Engine, this version boasts a constant 60 FPS, smoother animations, a removed speed cap, widescreen, a save function, three playable characters, and much more.

Incidentally, this version was released as an update to the existing iOS version, which was an emulator + ROM.

To do:

Level Select


Start a "No Save" game and choose a character. On the SEGA logo screen, tap the letters S-E-G-A in that exact order once the entire word appears, Or if using a controller press Up, Down, Left, Right at the title screen. If done correctly, you will hear the ring chime. Then hold two fingers on the bottom of the screen and wait (hold the jump button and press start if using a controller). After the title screen appears, you'll be taken to a Sonic 2-style Level Select.

To select a Special Stage, set the sound test value to 01-06 and select Special Stage. If Max Emeralds is set to 7, selecting 07 will pick the otherwise unused seventh Special Stage.

(Source: Sonic Retro)

There are several options aside from selecting levels and the Sound Test (they seem to become unlocked in the options menu though when you beat the game or perhaps fulfill other special requirements):

  • Player - Choose between Sonic, Tails, Knuckles, Sonic and Tails (like Sonic 2), or Knuckles and Tails.
  • Spindash - On or Off, like the Settings menu.
  • GND SPD Cap - Ground speed cap on/off. "On" simulates the original game.
  • AIR SPD Cap - Air speed cap on/off. "On" simulates the original game.
  • S1 Spikes - On/off. Toggles the infamous no-invincibility-frame spikes from the original game's initial release.
  • Items - S1, S2, S1+3, or S2+3. Seems to control what monitors appear. Selecting an option with "+3" gives Sonic the ability to use elemental shields and the insta-shield move from Sonic the Hedgehog 3.
  • Max Emeralds - 6 or 7 Chaos Emeralds. Choosing 7 allows all three characters (including Tails) to transform into their Super forms once you get 50 rings and double-tap the screen. The 7th Emerald is cyan in color. Some of the Emeralds also change color when toggling this option to match their modern palette.

Alternate/Hidden Level Select

The alternate level select

An alternate level select can be seen by either choosing the save file of a completed game, or placing an Animal Prison/Goal Sign at the beginning of Final Zone. It is fairly barren, lacking Zone names, options, and the ability to select anything but the first Act of a Zone. It is also not possible to access the Special Stage from this menu, though there is clearly space for it in the bottom-right corner.

Debug Mode


Play sounds 01, 09, 09, 01, 00, 06, 02, 03 (the US/European release date of the original Genesis game) in the Sound Test. During gameplay, tap the upper-left corner of the screen to access debug mode. To change the item you are placing, press the + or - on the top of the screen.

(Source: Sonic Retro)

Interestingly, the debug mode allows placement of many, many items that are not present in the main game. It seems the developers looked into the unused content from the original game, finished coding them, and left them unused. This cut content may have been meant to be restored in this port, but ultimately re-cut at the request of Sega as was the case with the 2011 Sonic CD.

Special Stages

Sonic 1 has a custom special stage editor that can be accessed via going to the level select, playing sound 08 and the selecting "Special Stage", if you have debug mode enabled in this special stage you can place down almost any special stage object to make your own special stages, you can even save and load layouts

To do:
Find out exactly how saving/loading works.


To do:
Confirm the function of the debug monitors.
  • Unused monitors - same as those present in the original game.
    • S - works like in Sonic 3, giving Super Sonic.
    • Robotnik - shows an image of Robotnik. Like Sonic 2 and 3, it hurts the player upon breaking it.
  • Debug monitors - used for toggling new features on the fly.
    • Spikes - shows an image of spikes. Breaking it plays the "hitting spikes" sound and toggles Sonic 1 spike behavior.
    • Three Shields - shows an image of the elemental shields from Sonic 3. This toggles the Items option, but it doesn't work on the fly.
    • Chaos Emerald - Plays the sparkle sound from Sonic 2 for Super Sonic. Each one broken toggles your emerald count from having 6, then to 7, then back to zero.
  • Image of 4 Robotniks - also present in the original. Adds collision to several platforms that don't have it normally. When placed, it acts like an invisible platform. A variant with images of Tails exists in Final Zone.
Several unused objects in Marble Zone.

Green Hill

  • Rolling ball - is now a functional object, unlike in the original game. It rolls down hills, can crush enemies, and can break through walls. You can push it to give it additional momentum and make it roll up hills, but it can crush Sonic if it falls on him.
  • Splats the Bunny - jumps around near a set spot or jumps in a set direction. Oddly, it doesn't seem to be affected by the rolling ball.


  • Sideways spikes - also seen in the original.
  • UFO - placing it makes a bunch of UFOs show up in the sky, as they did in early photos and footage of the original game. They fade in and out of sight and are merely a cosmetic addition.


  • Goggles monitor - breaking it gives Sonic goggles which only appear when you're underwater. It increases the time period Sonic can spend in water without air, and it breaks off Sonic's head like a shield if hit. The graphics were taken from the original game, though the function of this item was presumably changed: Dean Sitton stated that the goggles were originally just a cosmetic graphic.

Special Stage

  • Prohibitory sign - deletes items it's placed on.
  • Extra life icon - from the original.
  • Zone icons: - don't do anything. A blue "Zone 7" icon was added for this port.
  • "W" block - doesn't do anything.
  • 7th Chaos Emerald - Cyan, and it allows Sonic to transform into Super Sonic.

Seventh Special Stage and its Editor

The seventh Special Stage does not appear in-game by default; it is a custom level that must be created in a special editor and saved before it can be accessed in-game.

To access the editor for this Special Special stage, enter the Stage Select with debug mode enabled, set Max Emeralds to 6 but the Sound Test to 7, and select Special Stage.

The default layout in the editor is nothing but the word "custom" spelled out in generic Special Stage tiles. Upon entering debug mode, you will find three tiles that are not available anywhere else in the game: Load, Save, and Clear icons. You can delete individual objects with the aforementioned prohibitory sign.

  • Sonic1iOS-load.png
    Load icon - loads your last saved layout for your custom Special Stage when placed. Used in conjunction with the Save icon.
  • Sonic1iOS-save.png
    Save icon - saves the current layout of your custom Special Stage when placed.
  • Sonic1iOS-clear.png
    Clear icon - clears your custom Special Stage when placed.

After creating your Special Stage, go to the Level Select and set Max Emeralds to 7. Now your custom stage can be accessed during gameplay (where collecting the Emerald will allow your character to become Super), or by setting the Sound Test value to 7 and selecting Special Stage (helpful if you want to test your Special Stage). In both cases, debug mode will not give you the Load, Save, and Clear icons.

Hidden Credits


The hidden credits are still present. To see them, start a "No Save" game and choose a character. On the SEGA logo screen, tap the letters A-G-E-S in that order once the entire word appears. If done correctly, you will hear the ring chime and the credits will appear.

The credits translate to:

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

Additionally, Tails' name will change to "Miles" during gameplay.

(Source: Sonic Retro)

Unused Sprites

Most of these are, unsurprisingly, leftovers from the original Genesis game.

Special Stage

Artwork Name Description
Sonic1MDzonesprites.pngSonic1iOS-zone7.png "Zone" Icons Present in the original game, these icons would have indicated which Special Stage you were in. Interestingly, a Zone 7 icon was added to this port.
Sonic1MDSpecStage1up.gifSonic1iOS-SpecialStageTails1up.pngSonic1iOS-SpecialStageKnuckles1up.png 1-up Icon Extra life icon for the Special Stages, listed in the original game's instruction manual but never actually appearing in any of them in any iteration of the game without ROM hacking. It is still fully functional, and can be placed in any Special Stage. The icon disappears like a ring when touched. The Tails and Knuckles icons were added to this port.
Sonic1MDSpecStageW.gif "W" Icon A solid block. Its use is unknown and it has no function when placed in-game.


Artwork Name Description
Sonic1gen Tv eggman.png Robotnik Monitor Hurts the player, like in Sonic the Hedgehog 2's 2-player mode and Sonic 3.
Sonic1gen Tv goggles.png Goggles Monitor Gives Sonic goggles, which increase the time before Sonic drowns.
Sonic1Gen tv super.png "S" Monitor Makes the player Super when broken.
Sonic1iOS-spikemonitor.png Spike Monitor Breaking it plays the "hitting spikes" sound and toggles the Sonic 1 spike behavior.
Sonic1iOS-shieldsmonitor.png Three Shields Monitor Toggles the Items option when broken. Changes to the monitors will take effect when you restart the Act or advance to the next Act.
Sonic1iOS-emeraldmonitor.png Emerald Monitor Breaking it plays the sparkle sound from Sonic 2 for Super Sonic and toggles the maximum Emerald count. The first one broken sets your Emerald count to 6 and enables the good ending, the second one broken sets your count to 7 and enables Super Forms, and the third one broken sets your count to 0. This is the second game to have an Emerald monitor, the first being Sonic Triple Trouble.
Sonic1iOS-exclamationmarkmonitor.png Exclamation(?) Monitor The only monitor that isn't used in Debug Mode. It's either an exclamation mark or the Shrink powerup from Knuckles' Chaotix.


Artwork Zone Description
Sonic1iOS sonicwreck.gif Green Hill Zone The checkered ball can be placed with Debug Mode and actually works now. It can break through walls, deflect projectiles, and crush enemies.
Sonic1MDSplats.png Green Hill Zone Splats the Bunny is an unused badnik featured in promotional trading cards for the original game. There are two different variants. When placed in-game, he hops around near where you placed him or in a set direction.
Sonic1Gen Sidespike.png Marble Zone Horizontal spikes, rather than the vertical ones actually used in Marble Zone. They are also slightly thinner. They fully work upon placement, though.
Sonic1iOS-UFO.gif Marble Zone Placing it in Debug Mode will cause UFOs to appear in the sky. The UFOs were seen in early screenshots and footage of the original game.
Sonic1MDGoggles.pngSonic1MDSonicgoggles Run.gif Labyrinth Zone Sonic will wear these if a Goggles monitor is broken. They increase the amount of time Sonic can spend underwater without air.
Sonic1Gen Robotniklegs1.png 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.


Artwork Description
SonicCD11-tailslifeicons.png Leftover Tails life icons from the 2011 Sonic CD port, present among Tails' sprites.
SCD lifeicon leftover.png Leftover Sonic life icon from the 2011 Sonic CD port, present among the HUD sprites.
SCD11 Placeholder.png The default icon for sprites in the Retro Engine's Scene Editor, usually used for Objects that aren't seen/spawned