Sonic the Hedgehog Extended Edition

From Sonic Retro

Sonic the Hedgehog Extended Edition

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Its contents may change completely and frequently until this notice is removed.

Sonic the Hedgehog Extended Edition is a hack in progress by Cinossu of Sonic the Hedgehog on the Sega Mega Drive. In this version of the game, instead of new or fully edited zones, all the original zones are kept intact with minor editing to the acts. Instead, this hack extends the game beyond its original capabilities, including a zone map with warp rings to each act (much like in Sonic Advance 3), saving via SRAM slots (like in Sonic the Hedgehog 3), obtainable upgrades such as the Spin Dash and Super PeelOut (like in the Megaman X series) as well as a new type of ring, emerald, and special stage to add to the mix.

While work has not been shown on the hack for a while publicly, a lot of work goes on in private. This is mostly Cinossu either restarting the entire thing from scratch (currently on the 5th restart since conception), or constantly adding and refining new features and ideas. The latest restart is most likely the last one, however, as the disassembly is now so modular that the various chunks can be restarted rather than the entire hack.

As mentioned above, ideas are often refined, updated and changed for this hack, so it is a good idea to keep checking this page about further details from the latest versions (both information and pictures). It is unlikely to be posted in other places until it is ready to be released publicly.
S1ee title.png
Sonic the Hedgehog Extended Edition
Version: 1.0
Last release: 21st October 2006
Status: In progress
System: Sega Mega Drive
Original game: Sonic the Hedgehog (16-bit)

Sonic the Hedgehog Extended Edition Contents

Starting Up

Sega Mega Drive
  • Set up your Sega Mega Drive System as described in its instruction manual. Plug in Control Pad 1.
  • Make sure the power switch is OFF. Then insert the Sega cartridge into the console.
  • Turn the power switch ON. In a few moments, the Sega splash screen appears.
  • If there is a problem with the sram save data, a different screen will appear. Press the Start button on Control Pad 1 to clear the erroneous data, and the game will take you to the Sega splash screen.
  • If neither of these screens appear, turn the power switch OFF. Make sure your system is set up correctly and the cartridge is properly inserted. Then turn the power switch ON again.

Important: Always make sure that the Console is turned OFF when inserting or removing your Mega Drive Cartridge.

Note: This game is for one player only.

1 Sega Cartridge

2 Control Pad 1



Time travel; a phenomenon not properly encountered by the residents of the many zones of the planet since the day Dr. Ivo Robotnik, the mad scientist, chained the mysterious "Little Planet" to the local terrain, bringing forth a devious plot to conquer using the Little Planet's Time Stones to his advantage. It was rather a surprise, therefore, when several inhabitants of the Sunset Hill Zone noticed one of the many long-forgotten time travel posts just sitting along a stretch of grass, as if it were naturally meant to be there. Many thought it was a replica, homage to an adventure long past, whilst others thought it just a mirage, a trick on the eyes, and that it would soon disappear exactly like the Little Planet it originated from...

... but there were the small minority who believed it to be real, and an omen of things to come...


Running through the Sunset Hill Zone, Sonic the Hedgehog was supposedly out searching for a rumour, a relic of a former encounter with the evil Dr. Robotnik some 13 years previous... in actuality, he was getting quite bored. The local population hadn't heard from the doctor in a while and they were all enjoying the peace and quiet whilst it lasted, knowing it wouldn't for very long, and searching for something that only few truly believed existed was not Sonic's ideal form of relaxation. He'd much prefer to be lounging out on a reclined chair at the beach, a cool drink in one hand, and shades over his closed eyes, listening to music blaring out through his portable stereo...

... so lost in thought was the fastest creature on the planet that he did not realise he was slowly beginning to run faster, past his ‘jogging' speed and to those only he could get to by foot. Reaching a speed of above 88 MPH, Sonic was knocked out of his daydreaming as his body came into accidental contact with an object that he hadn't seen in over a decade; a time travel post, specifically one linked to the past. Remembering the critical velocity required for such an object to work, the hedgehog realised too late what was to occur. With a flash of light and a loud boom, Sonic the Hedgehog was gone from the Sunset Hill Zone, leaving only a still-spinning post and a faint echo in his wake...


Control Pad


1 D-Button

  • Change the current selection on the title screen.
  • On the sound test screen, changes the current bgm/sfx selection. [More info]
  • Moves Sonic left and right. Hold the button Left or Right to speed up. When used against a wall or an object, will also attempt to push it.
  • Makes Sonic look up or crouch down. Hold the button Down while standing still to crouch, or hold Up to look upwards. (This won't work if Sonic is already at the highest or lowest point.)

Start Button

2 Start Button

  • Skips all splash screens and starts the game introduction, and skips the game introduction and goes to the title screen.
  • Brings up the selection on the title screen.
  • Selects the highlighted option on the title screen or menu screen.
  • With SOUND TEST highlighted, takes you to the sound test screen. [More info]
  • On the sound test screen, takes you back to the title screen.
  • Pauses a game, and resumes a paused game.
  • Resumes a game when there is text on screen.

Button A, B or C

345 Button A, B or C

  • Skips a single splash screen to the next, and on the final splash screen starts the game introduction. Also skips the game introduction and goes to the title screen.
  • On the sound test screen, pressing button C plays the currently selected bgm/sfx. Holding button A allows you to change the currently playing bgm's pitch, and holding button B allows you to change the currently playing bgm's tempo. [More info]
  • Makes Sonic perform a Spin Attack.

Special and Obtainable Moves

Spin Attack
Spin Attack

Spin Attack

  • Press the Down Button when Sonic is moving to roll through enemies and item monitors alike with the Spin Attack.
  • Press Button A, B or C to jump and perform the Spin Attack through the air, allowing you to bounce off of enemies and item monitors alike.
Super Peel-Out

Super PeelOut

  • While standing still, hold the Up Button and then press Button A, B or C to charge up a Super PeelOut. When your charge is full, release the buttons to dash off in the direction you were facing in a burst of speed. This will only work once you have obtained it. [More info]
Spin Dash Attack

Spin Dash Attack

  • While standing still, hold the Down Button to crouch, and then press Button A, B or C to charge up a Spin Dash Attack. When your charge is full, release the buttons to dash off in the direction you were facing in a high-speed Spin Attack. This will only work once you have obtained it. [More info]
Other Obtainable Moves

Other Obtainable Moves

  • There are more moves obtainable than just the Spin Dash Attack and Super Peel-Out, so look out for them in-game. [More info]
  • When you obtain moves, you'll get on-screen instructions on how to use them.

Getting Started

When you turn the power on, a few splash screens appear before the game introduction starts. After the game introduction is finished, the title screen is displayed, where you get the options of starting a game or going to the Sound Test. [More info] If you are idle at the title screen until the music is finished, the demonstration mode begins. In demonstration mode, a small section of an act is played until you press any button or the demonstration time runs out, returning to the title screen.

As Sonic, you must evade traps and avoid enemies as you dash through seven hazardous zones using your available moves. Your goal is to rescue your friends from their egg prisons at the hand of Dr. Robotnik.

Grab the Rings


Staying alive will be tough, but you can grab Rings along the way. As long as you have at least a single ring you will not die when you get attacked or touched by an enemy, and instead you will lose all your currently held Rings. If you get attacked or touched by an enemy when your Ring count is at 0, you will die and lose a life. (Even if you are using the Spin Attack, you will lose a life if something smashes or squashes you.)


New to the game are the Negative Rings, or NegaRings, that decrease your ring count and can even make it go into negative numbers. While the number is negative, getting attacked or touched by an enemy results in the same response as a normal positive ring count; you lose all your currently held NegaRings, setting your Ring count back to 0. The NegaRings are differentiated from the normal positive golden yellow Rings with a blood red colour instead.

In Game On-Screen Counters

On-Screen Counters

In game, using the on-screen counters, you can keep track of your Ring count along with your score, current number of lives, and the time it has taken you in the level so far.

1 Score

The in-game score count. There are many ways to add to your score, including destroying enemies and in-level destroyable blocks, as well as score bonuses at the end of the level. When you destroy an enemy, you will be awarded 100 points. However, if you manage to chain-kill a group of enemies, the points you receive will increase the more you destroy.

At the end of each level there is a tally of how many Rings you have collected and of the time it has taken you to complete the level. For each Ring you have collected, there is a bonus of 100 points. (Example: if you collect 100 Rings in the level, you will receive a Ring bonus of 10,000 points.) Depending on how quick you complete the level, you will also receive a Time bonus. Below is a list of Time bonuses and their respective time ranges:

  • 50,000 points - 30 seconds or under.
  • 10,000 points - 30 to 45 seconds.
  • 5,000 points - 45 seconds to 1 minute.
  • 4,000 points - 1 minute to 1 minute 30 seconds.
  • 3,000 points - 1 minute 30 seconds to 2 minutes.
  • 2,000 points - 2 to 3 minutes.
  • 1,000 points - 3 to 4 minutes.
  • 500 points - 4 to 5 minutes.
  • 0 points - 5 minutes or above.

At the end of the tally, these bonuses are added on to your current score before returning to the zone map.

2 Time

The time elapsed in the level so far. Shows minutes, seconds and centiseconds, giving you an accurate account of how long it has taken you so far, or even how long it has taken you to complete the level. The timer has a range up to 10 minutes, at which time you will get a Time Over and lose a life. In the final minute, the Time text will flash red warning you that you are close to a Time Over.

In some cases, this timer will already start with a time and count downwards to 0. In this case, the Time text will again flash when you get to the final minute, but you will not necessarily get a Time Over when the timer eventually does reach 0. What happens at this point depends on where in the game you are.

3 Rings

The current number of Rings you have. If this is at 0, the Rings text will flash red, indicating that one more hit will make you lose a life. If your Ring count reaches 100 you will receive an extra life. You will receive another if you manage to reach 200 Rings as well. Losing Rings and reaching 100 Rings again in the same level will not give you another extra life, however.

4 Lives

The number of lives you have left. At the start of a new game, you will have 3 lives. By collecting 100 (or 200) Rings in a level, getting extra life monitors [More Info], or getting an increment of 500,000 points will get you more. You lose a life by hitting or touching enemies with 0 Rings, getting squashed, or falling off of the level. When you reach 0 lives, you will get a Game Over. [More Info]

World Entrance

World Entrance

When you choose to start the game from the title screen you will be taken to the World Entrance, a small mini-level where you get the choice of save slots and the non-saving slot, as well as a method for deleting the data from the save slots. In this small mini-level you cannot get hurt or die, nor is there a timer.

Save Slots

If you walk to the right you will encounter a path split in three ways, enabling you to go either straight ahead, above, or below. Each path leads to a Warp Ring for three different save slots, allowing you to save up to three different game progresses at once.

Save Slot
On-Screen Counters

When you walk up to one of these save files you will notice new on-screen counters appear, different to those used whilst in the main game. These, along with the signpost, show the save slot's data.

1 Score

The current Score for the game progress in the save slot.

2 Time

The Global Timer for the game progress in the save slot. Time spent both in Zone Acts and on the Zone Map will add to this.

3 Rings

The Global Ring Count for the game progress in the save slot. This will be added to (or taken away from) at the end of every Zone Act.

4 Chaos Emeralds

The status of Chaos Emeralds [More Info] collected for the game progress in the save slot. The empty spaces will fill in as you collect each Chaos Emerald.

5 Sol Emeralds

The status of Sol Emeralds [More Info] collected for the game progress in the save slot. The empty spaces will fill in as you collect each Sol Emerald.

6 Progress Signpost

A signpost showing the game progress of the save slot. The text New and a greyscale image of Sonic mean that the slot is currently empty. The text "Zone" and a number with a coloured image of Sonic means that a game progress exists in the slot ready for continuation, the number being the current Zone Map saved on. Text saying Clear means the slot is complete in that the Final Boss has been beaten. However, this does not neccessarily mean the game is 100% complete. A Dr. Robotnik image on the signpost means that the save slot data is corrupt.

7 Lives

The Current Lives Count for the game progress in the save slot.

8 Warp Ring

Jump into this spinning Warp Ring to start or continue the game progress in the save slot.

Delete Button

Deleting Data

On the middle path, before the save slot, you will notice a button with a signpost above it showing a Dr. Robotnik image on it. This button, as it is labelled by the signpost, is the delete button for the save slots. Upon pressing it, the palette of the World Entrance will turn grey and the music will change, meaning you are in delete mode. To delete a save slot, enable delete mode and go to the save slot you wish to delete. Upon entering the Warp Ring, the slot will be deleted, and the Warp Ring will reappear for the new and empty save slot. When you have deleted a save slot, delete mode will automatically be canceled so you can start the empty save slot immediately. To cancel delete mode, just jump on the delete button again.

Non-Save Slot

Non-Save Slot

If you walk to the left, you will see a single Warp Ring with the entrance to a non-saving game. Jumping into the Warp Ring will start a new game as if you were starting an empty save slot. However, Save Posts [More Info] will be disabled, any unlockables will not stay unlocked, and all progress made will be lost the next time you play the game. It is advised to play using the non-save slot only when playing a quick game or when all three save slots are in use and one cannot be deleted.

None of the on-screen counters shown at a Save Slot will be visible at the Non-Save Slot as all the data for it is blank.

Zone Maps

Zone Map

Once you jump into a Warp Ring on the World Entrance, you will be taken to the Zone Map; a small mini-level of the current Zone you are in. From this central Zone hub you have access to each of the Zone's acts to play in any order, as well as the ability to save (provided you have obtained a Save Post first) and to play the Zone's Boss act once the first three acts have all been played through at least once. From your starting position on the Zone Map, there will be indicators on which ways to go.

Saving Your Game

Save Post

Usually near your starting position on the Zone Map, there will be a small area marked with a sign that will contain a Save Ring. Jumping into this Save Ring will save your progress in the current save slot you are playing, including your current level progress, Rings, Score, Lives, Chaos and Sol Emerald counts, and abilities. When you first enter a Zone Map you will find the area marked with the sign but no Save Ring present. This is because it must be activated first by finding a Save Post hidden in an act of the Zone. Toggling one of these Save Posts will add a small indicator that you have done so at the bottom of the screen next to your Lives counter, also adding a Save Bonus of 50,000 points to your score at the end of the act and activate the Save Ring when you re-enter the Zone Map after the end of act score tally, allowing you to save your game. Within the Boss act of the Zone, a Save Post is given to you automatically after beating Dr. Robotnik at the end of it.

On-Screen Counters

Within the Zone Map, a limited set of on-screen counters are visible. These show your Score, your Lives, and current Rings count for the Zone Map. Whilst it may seem that a Rings counter is unneeded on these small mini-levels, it is not completely useless if you search your surroundings carefully...

Zone Act Warp Rings and Signposts

Act Posts

When first entering a Zone Map, there are three Warp Rings available for you to jump in to, each one for an act of the Zone, able to be played in any order. Next to the Warp Ring will be a signpost indicating both the the act and its completion progress. At first, the incompleted act's signpost will show Dr. Robotnik's face, indicating that the act has not been beaten at all yet. Upon completion the first time, this signpost will change to that of Sonic's face. Upon completion a second time [More Info], the signpost will change yet again, to indicate a further completion, with a different image of Sonic's face.

Act Completion Signpost

Somewhere within the Zone Map, at first, you will find a different type of signpost and a wall you are unable to pass. The signpost here indicates the completion status of each of the three acts of the Zone. Once all three acts have been completed at least once, and the signpost shows three Sonic heads by each act, you will be allowed access past the wall and to a further Warp Ring and act completion signpost, this time specifically linking to the Zone's Boss act. Again, the signpost here will initially show Dr. Robotnik's face, changing to Sonic's faces upon first and second time completion.

Zone Completion and Backtracking

Once all three acts and the boss act of the Zone are complete, a further wall past the Boss act area will become passable, and allow access to one further Warp Ring that leads to the next Zone. Zones after the first will also have an extra Warp Ring allowing access back to the previous Zone.

Items for Survival

As well as Rings, NegaRings and items related to saving your progress, there are different types of item that will help Sonic along the way, along with those that will hinder his journey. Some are specific to a zone, whereas there are some that are global for the entire game.



Lampposts are placed throughout the game, and you are guaranteed to find at least one somewhere within each act of every zone. When you encounter a Lamppost, touching it acts as a checkpoint midway through an act. Upon touching a Lampost the blue lamp will spin around the post and begin to flash red and yellow to show it has been triggered. These checkpoints save your current score and time within an act, so if you lose a life (provided you haven't lost them all) you will reappear at the last Lamppost triggered instead of the very beginning of the level. Do note, however, that they do not record the amount of Rings (or NegaRings) collected, so if you lose a life and return you will have a Ring count of 0.

Lamppost Ring Bonus Stars

If you are in an act and touch a Lamppost and you have 100 or more Rings on your Ring count, a spinning set of yellow stars will appear and orbit above the Lamppost for a brief period of time. If you jump into this spinning set of stars you will be taken to the Bonus Stage. [More Info] Upon completion of the Bonus Stage, you will return to the act at the Lamppost where you entered, as if you had just reappeared from losing a life (without having lost a life), meaning your score and time will be the same but your Ring count will be back at 0. If you have 100 or more NegaRings when coming into contact with a Lamppost, there will be a spinning set of red stars orbitting instead. Jumping into this set of stars will again take you to a Bonus Stage, only one of a greater difficulty. Do note that if you open a spinning set of stars to the Bonus Stage and happen to walk away so the stars and the Lamppost are off-screen, the entrance will not be there when you return.


Yellow and Red Upward Springs

Springs are found in most acts, and their purpose is to push (ie. "spring") you at speed in a specific direction. They come in three colours, yellow, red and blue, and each has a different force behind it. Whilst a yellow Spring will push you in a specific direction fairly tamely, a red Spring will propel you at an extremely fast speed. Blue Springs are even more powerful than the red Springs but are extremely rare to find within the game as they only lead to the furthest of reaches within acts. Springs can be in any of the four main directions - up, down, left or right - and are useful in reaching places a normal jump or run cannot.

Do watch out, however, as while in a majority of cases the Springs will aid you through the game, there are some that will not. Always be on the look out for where the Spring is leading you to, as it could be straight into enemies, a set of spikes, a bottomless pit, or backwards through an act meaning you have to traverse through it again.



Spikes, again, are found in most acts, and will hurt you when jumped on to, landed on, or just touched on their spiked edge. They can still be touched on their non-spiked edges, however, such as from the sides on upwards facing spikes, or on top or from underneath in the case of side facing spikes. In some cases, there are spikes in some levels that disappear into the ground or wall, only to appear again a second later.

Whilst after being hit by the majority of enemies in this game gives you a slight invulnerability time where Sonic will flash [More info], spikes ignore this invulnerability and you will be hurt again or killed immediately upon touching them during this time.



Buttons are the simplest of objects to operate; you jump on them. Whilst not necessarily found in every zone, each button does something different depending on the situation you are in. You will find that some may appear useless when in fact they have repercussions later on (or even earlier on) in an act, and you may even find that some have more than one function. Some examples of uses are for opening doors and pathways, changing the direction of moving objects, and clearing away obstacles, amongst other uses..

Some you will have to toggle to use, and some you may have to stay standing on to work. If the latter is the case, you may want to push something on to it to get it to stay pressed down..

In the entrance zone there are button options. One of the buttons has the drums from Sonic 1, and the other one of the buttons has the drums from Sonic 3.

Item Monitors

Item monitors hold power ups that can help (or detriment) you through the game, and are found in every act. To get to the power up, all you have to do is either jump on to or spin through them.

10 Ring Item Monitor
10 Rings

Picking up this item monitor adds 10 Rings to the Ring count.

10 NegaRing Item Monitor
10 NegaRings

Picking up this item monitor adds 10 NegaRings to the Ring count.

Ring Polarity Swap Item Monitor
Ring Polarity Swap

This item monitor swaps the Ring "polarity", as in whether the Ring count is in Rings or NegaRings. For example, if you have 50 Rings and you pick up this item monitor, you will have 50 NegaRings as the result. Obviously, this item monitor does nothing if your Ring count is at 0.

Shield Item Monitor

This item monitor gives you a shield that acts as a one-hit barrier between you and the enemies, and the shield itself is a spinning semi-transparent blue sphere around Sonic. If you are hit with the shield, the shield itself is lost rather than losing Rings or dying, but it will not protect against bottomless pits or being crushed.

Invincibility Item Monitor

Picking up this item monitor gives you temporary invincibility for a period of around 15 seconds. During this time, sparkling trailing stars will appear around Sonic, and you will be able to run straight through enemies to destroy them and over spikes without taking a hit or losing any Rings. However, like the shield, invincibility will not protect against bottomless pits or being crushed.

Power Sneakers Item Monitor
Power Sneakers

This item monitor, when picked up, gives you a temporary burst of extra speed, making Sonic able to accelerate and run faster through the current act for approximately 15 seconds. In addition to speeding Sonic up, the music will also be sped up to indicate the change, and also the change when it slows back down.

Extra Life Item Monitor
Extra Life

Picking up this item monitor will give you an extra life.

Dr. Robotnik Item Monitor
Dr. Robotnik

The effects of this item monitor are just like being hit by an enemy. If you pick up this item monitor with Rings or NegaRings on your Ring count, they will be lost. If you pick it up with a Ring count of 0, then you will lose a life.

Unknown Item Monitor
Other Item Monitors

In specific situations and scenarios in the game, you may encounter different monitors to the ones listed above. Do not be afraid to try them out and see what effect they have on playing.

Act End Signpost


At the end of acts 1 to 3 of every zone, there is a signpost bearing the resemblance of Dr. Robotnik on it. Run past it to spin it around and change the image on its face to that of Sonic. Once it stops spinning the act is complete, and Sonic will run to the right to allow the end of act tally to commense.

The resulting image will change depending on whether it is the first or subsequent run-throughs of the act. [More info]

Animal Prison Capsule

Animal Prison Capsule
Animal Prison Capsule

After beating Dr. Robotnik at the end of the boss act for a zone, there will be an animal prison capsule waiting to be opened instead of a signpost. Upon jumping on the top button, the machine will begin to explode, break apart and open, allowing the trapped animals inside of the prison capsule to escape.

When playing through the boss act and beating the boss the first time, you will notice that the prison capsule is quite small and only contains a few animals. However, upon playing and beating the boss each subsequent time, the prison capsule will be larger in size and contain many more. [More info]

Dr. Robotnik's Badniks

Along your journey through each act Dr. Robotnik has not only trapped Sonic's animal friends in the prison capsule at the end of each zone but also individually inside badniks; robot enemies designed to harm you and get in the way of your path. The many varied types of badniks are listed below. You can usually destroy these badniks and free the animal trapped inside by performing the spin attack; either spinning through them or bouncing off of them. However, each badnik has its own unique way of harming you, either through projectiles or spiked protrusions on their body, so be careful in your encounters with them.

Crabmeat Chopper Motobug
Crabmeat Eng Name: Crabmeat
Jap Name: ガニガニ (Gani-gani)
Chopper Eng Name: Chopper
Jap Name: バタバタ (Bata-bata)
Motobug Eng Name: Motobug
Jap Name: モトラ (Motora)
Buzz Bomber Newtron Caterkiller
Buzz Bomber Eng Name: Buzz Bomber
Jap Name: ビートン (Beeton)
Newtron Eng Name: Newtron
Jap Name: メレオン (Meleon)
Caterkiller Eng Name: Caterkiller
Jap Name: ナール (Nal)
Batbot Roller Spiked Hermit
Batbot Eng Name: Batbot
Jap Name: バサラン (Basaran)
Roller Eng Name: Roller
Jap Name: アルマ (Arma)
Spiked Hermit Eng Name: Spiked Hermit
Jap Name: ヤドリン (Yadorin)
Burrobot Jaws Orbinaut
Burrobot Eng Name: Burrobot
Jap Name: モグリン (Mogurin)
Jaws Eng Name: Jaws
Jap Name: プクプク (Puku-puku)
Orbinaut Eng Name: Orbinaut
Jap Name: ウニウニ/ウニダス (Uni-uni/Unidus)
Splats Ballhog Bomb
Splats Eng Name: Splats
Jap Name: ウサギン (Usagin)
Ballhog Eng Name: Ballhog
Jap Name: トントン (Ton-ton)
Bomb Eng Name: Bomb
Jap Name: ボム (Bomb)



Download S1EE (First Release)

File: Sonic_the_Hedgehog_Extended_Edition_(First_Release).zip (480 KB) (info)
Release Date: 21st October 2006

Download Currently no other released versions

External Links

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