When asked "What would you have done differently with Sonic Generations?"

After brainstorming and coming up with some more ideas, here's what I would have changed in the HD Version.

The Playable Characters (HD Version)

There are 6 Playable Characters, each with their own set of Skills.

1. Retro Sonic

• this Sonic is from the year 1997 and got sent to the year 1991 via Warp Ring
• he can talk
• his basic moves are the Spin Jump, Spin Dash, Super Peel-Out, and Insta-Shield
• has a better memory of the years 1991-1997 than Modern Sonic

2. Retro Tails

• an optional playable character unlocked after restoring Green Hill
• this Tails is from the year 1997
• got thrown into the past by Time Eater
• he is playable in Act 1 of any Stage and against any of Retro Sonic's Bosses
• players can choose to play as Retro Sonic and have Tails tag along either as a computer controlled power-up partner, or in Co-op with 2 players (Sonic 3 and Knuckles)
• flies the original Tornado
• has a better memory of the years 1991-1997 than Modern Tails
• when you have all Emeralds, you can activate his "Super State", Turbo Tails, Flickies and all

3. Retro Knuckles

• unlocked after clearing Sky Sanctuary Act 1
• this is Knuckles is from the year 1997
• he is playable in Act 1 of any level in the game and against any of Retro Sonic's Bosses
• he can break objects just by running into them
• when you have all Emeralds, you can activate his "Super State", Kinetic Knuckles

4. Modern Sonic

• can replace the slide with rolling or the spin dash
• can change the Grind Step to LB/RB

5. Shadow

• an optional playable character unlocked after defeating Titan Eggrobo
• he is playable in Act 2 of any level in the game and against any of Modern Sonic's Bosses
• has a Chaos Gauge, which only fills when he destroys enemies.
• when you have all Emeralds, you can activate his "Super State", Super Shadow

6. Silver

• an optional playable character unlocked after defeating Neo Metal Sonic
• he is playable in Act 2 of any level in the game and against any of Modern Sonic's Bosses
• can't Spin Jump but has a higher Jump than Sonic and Shadow
• has a Psychic Gauge. It is full at the beginning of every level and it automatically refills itself, but at a slow pace.
• instead of a Homing Attack, Silver throws Psychic Knives
• when you have all Emeralds, you can activate his "Super State", Super Silver

White World Changes

• when you clear an Act Gate, not only do the colors in the foreground return, but in the background you can see objects and features from that level, instead of it just being white
• there is actually a sky in the White World, that shows the Sun and Moon. The White World as well as a few levels will change visually while playing. You can choose this setting after fixing the Clocktower.
• there will be a new area to the left of the Genesis Era called "Timeless Town"

Timeless Town

Timeless Town is a 3D expansion of the Collection Room. This is basically a hub town that starts out as White and empty as the White World. As you play through the game, however, the area will become colorful and populated by the Sonic characters you've found and rescued.

Techno Base

• here you can use a giant sized version of the computers from Sonic Adventure/Sonic Adventure 2 that acts as Information Pod
• there is a function where you can add new Item Boxes to the Acts...
• there is an Airplane Field behind this
• Modern Tails will be here, working on gadgets that will help you out
• Omega can be found here and will give you information on enemies
• Jet, Wave, and Storm can be found here and will challenge you to races for the Chaos Emeralds

Marketplace

• Here Sonic can use the Skill Points he has collected to buy extra lives, new Skills, Item Box CDs, and other items
• the Skill Shop is still run by Omochao, where you can buy new skills and extra lives
• the Black Market is owned by the Chao from Sonic Adventure 2 Battle, and sells different items
• there's a Hot Dog Stand run by Mighty and Ray. The hot dogs act as power-ups, that can be activated during the levels

Museum

• one room contains the game's unlockable artwork
• there is Statue Room that shows 3D models of characters that come with detailed profiles
• Retro and Modern Espio can be found here

Theater

• this is an area where you can watch the game's cutscenes, as well as the CGI movies featured in the trailers
• Retro and Modern Amy can be found here

Music Plant

• a dancehall, where you can listen to music you've unlocked
• once you have cleared an Act, you can listen to its music
• once you have cleared both Acts of a Stage, you can listen to the stage's original soundtrack
• Retro and Modern Vector can be found here

Game Land

• here you can play the minigames "Casino Night", "Mystic Cave", and "Sky Chase"
• Retro and Modern Charmy can be found here

Sonic Suite

• this is a hotel, that has 3 floors
• each character can has their own hotel room
• in the master bedroom are game consoles and 2 Storybooks with new chapters...

Chao Garden

• the Chao Garden can have up to 20 Chao
• Cream, Cheese, and Vanilla can be found here
• Yakker and the other Wisps can be found here

Emerald Shrine

• is guarded by Modern Knuckles and Blaze
• Time Stones, Chaos Emeralds, Sol Emeralds, and the Master Emerald appear here after being collected
• after you find all 7 Chaos Emeralds, you will be able to turn on the "Super State" option

Green Park

The area where Modern Sonic's Birthday Party was supposed to take place...

HD Version's Levels and Bosses

Changes

• 3 Eras: Genesis/Mega Drive, Dreamcast, and Modern
• levels come from 11 different games
• there are no missions
• players can pick any level in each Era, instead of just going in chronological order

Genesis/Mega Drive Era

1. Green Hill

• -From Sonic the Hedgehog (June 23, 1991)
• Characters Rescued: Retro and Modern Tails

2. Chemical Plant

• -From Sonic the Hedgehog 2 (November 20, 1992)
• -unlocked after restoring Green Hill
• Characters Rescued: Retro and Modern Amy

3. Ice Cap

• -From Sonic the Hedgehog 3 and later in Sonic Adventure
• -unlocked after restoring Green Hill
• Characters Rescued: Mighty and Ray

4. Sky Sanctuary

• -From Sonic and Knuckles
• Characters Rescued: Retro and Modern Knuckles

5. Stardust Speedway

• -From Sonic CD
• -unlocked after Restoring Green Hill
• -in Act 1, Retro Sonic can run through the present and the past.
• -in Act 2, Modern Sonic can run through the present and future. If the machine gets destroyed in Act 1, the future will be good. If not, the future will be bad.
• Characters Rescued: Retro Vector and Charmy

6. Death Egg

• -From Sonic 2 and later in Sonic and Knuckles
• -unlocked after Restoring Green Hill, Chemical Plant, Ice Cap, Sky Sanctuary, and Stardust Speedway
• Characters Rescued: Retro Espio

Death Egg Robot

• -From Sonic the Hedgehog 2
• -unlocked after Restoring 2 Genesis Era Stages
• -Retro Character Boss Fight

Retro Metal Sonic

• -From Sonic CD
• -unlocked after Restoring 4 Genesis Era Stages
• -Retro Character Boss Fight

Titan Eggrobo

• -From Sonic and Knuckles
• -unlocked after Restoring all the Stages and defeating Death Egg Robot and Metal Sonic
• -Modern Character Boss Fight

Dreamcast Era-unlocked after defeating Titan Eggrobo

7. Speed Highway

• -From Sonic Adventure
• Character Rescued: Chao

8. Sand Hill

• -From Sonic Adventure
• Character Rescued: Big and Froggy

9. City Escape

• -From Sonic Adventure 2
• Character Rescued: Rouge

10. Final Rush

• -From Sonic Adventure 2
• Character Rescued: Cream, Cheese, and Vanilla

11. Seaside Hill

• -From Sonic Heroes
• Character Rescued: Modern Team Chaotix

12. Sky Fleet

• -From Sonic Heroes
• -like Seaside Hill, both Acts are a combo of Egg Fleet and Final Fortress
• Character Rescued: Omega

Egg Viper

• -From Sonic Adventure
• -unlocked after Restoring 2 Dreamcast Era Stages
• -Modern Character Boss Fight

Perfect Artificial Chaos

• -unlocked after Restoring 4 Dreamcast Era Stages
• -Modern Character Boss Fight

Neo Metal Sonic

• -From Sonic Heroes
• -unlocked after Restoring all the Dreamcast Era Stages and defeating Egg Viper and Perfect Artificial Chaos
• -Retro Character Boss Fight

Modern Era-unlocked after defeating Neo Metal Sonic

13. Crisis City

• -From Sonic the Hedgehog 2006
• Character Rescued: Silver

14. Kingdom Valley

• -From Sonic the Hedgehog 2006
• Character Rescued: Blaze

15. Rooftop Run

• -From Sonic Unleashed
• Character Rescued: Marine

16. Eggman Land

• -From Sonic Unleashed
• Character Rescued: Team Babylon

17. Planet Wisp

• -From Sonic Colors
• Character Rescued: Yakker

18. Terminal Velocity

• -From Sonic Colors
• Character Rescued: Mother Wisp

Egg Wyvern

• -From Sonic the Hedgehog 2006
• -unlocked after Restoring 2 Modern Era Stages
• -Retro Character Boss Fight

Egg Dragoon

• -From Sonic Unleashed
• -unlocked after Restoring 4 Modern Era Stages
• -Modern Character Boss Fight

Nega Wisp Armor

• -From Sonic Colors
• -unlocked after Restoring all the Modern Era Stages and defeating Egg Wyvern and Egg Dragoon
• -Retro Character Boss Fight

Regular Ending

???-After defeating Nega Wisp Armor and collecting all 7 Chaos Emeralds

19. Twisted Timelines

• -Act 1 has characters running through a fusion of the Genesis Era levels
• -Act 2 has Modern characters running through a fusion of the Dreamcast Era Levels
• -Act 3 has both Sonics running through a fusion of the Modern Era Levels
• -Time Eater appears in the background to fire homing shots at you

Perfect Time Eater

• -unlocked after clearing Twisted Timelines
• -Super Sonic Boss Fight

True Ending

Emerald Races

After seeing the regular ending, talk to the the Babylon Rouges in the Techno Base in Timeless Town. They will find locations for the Chaos Emeralds, but will challenge you to a race to see who can get it first.

Location-Chaos Emerald

1. Ice Cap-Green
2. Stardust Speedway-Purple
3. Speed Highway-Blue
4. Final Rush-Yellow
5. Sand Hill-Red
6. Kingdom Valley-Cyan
7. Terminal Velocity-Grey

Comments

When I came up with the list, I set some rules for myself.

Don't take out levels that were already picked

So as of right now, there are 9 levels plus 4 that the boss fights take in.

Stick to 3 Eras

Originally, I wanted to add the Saturn Era in, but after a poll I did, I found that most people wouldn't cared for it.

Keep the Eras Balanced

In the current game, each Era has 3 levels, 1 Rival, and 1 Boss. So if I add a level to the Genesis Era, I need to add a level to the Dreamcast and Modern Era.

Give the People what they want

If there's something we would liked in the game, I added it in.

Any New Bosses Need to be final bosses, robots, and someone Sonic fought originally

Basically, any boss I add to the game needs to be a robot boss that appears after the last level or in the last story. I choose robot bosses because I wanted Retro Sonic to have more boss battles than Modern Sonic since most of the levels are chosen from Modern Sonic's games and Retro Sonic never fought ancient creatures or gods in his games. Also, the boss had to be someone Sonic originally fought against.

Pick stuff that could work Storywise

Anything that can be used to make a better story.

So from here I started with the Genesis Era. First off, Stardust Speedway and Death Egg would be made into full levels.

Second, since most people asked for it, I added Ice Cap in. This is the only Sonic game I added in.

Finally, since this was something else people asked for, I added in the final boss of Sonic and Knuckles, who I nicknamed "Titan Eggrobo".

So now, the Genesis Era has 6 levels and 3 bosses.

Now I need to go balance out the Dreamcast and Modern Eras.

First, Final Rush was made into a full level. Since Sonic Adventure 2 now had 2 levels represented, I decided to take another level from Sonic Adventure and Sonic Heroes.

I chose Sky Fleet for a second Heroes stage, since that was the battlefield for Egg Emperor and Neo Metal Sonic and because that level is awesome.

I chose Sand Hill because it was an area where one of the Chaos Emeralds were originally and because it was a theme that wasn't already present in any of the levels.

For the bosses, I added Egg Viper, the last boss of Sonic's story in Sonic Adventure and Neo Metal Sonic, the final boss of Sonic Heroes. Perfect Artificial Chaos is a replica of Perfect Chaos created using data on the Artificial Chaos enemies on the SCA, which would explain why Modern Sonic can fight him without going super and he can maintain this form without all 7 Chaos Emeralds.

Then we have the Modern Era.

Originally, I did think about adding a level from Sonic Rush or Sonic Riders, but I decided to do the same thing I did with the Dreamcast Era.

The Egg Dragoon fight took place in Eggman Land, so Eggman Land became a full stage.

People asked for Kingdom Valley, so I added in.

Finally, I added in Terminal Velocity and Nega Wisp Armor, because it was the ending point of Sonic Colors, which leads up Eggman finding Time Eater. Also, some people asked for Nega Wisp Armor.