Sonic 3 Extended World CD

By Jdpense
   

Description:

This project is a brand new take of redesigning of Sonic 3! This project consists of a 3-in-1 package made by Jdpense, that has new routes and scripted events for each of the players in the game! In addition an overhaul of changes to the levels there are also changes to Special Stage with an overhaul of layout changes along with newer spheres from the last build added for an extra challenge.

Although, this build is different from last year's, since it's switched over to Sonic 3 Alone as the base game instead of Sonic 3 and Knuckles due to it being more simple to use. Along with that, Sonic and Tails are the only playable characters in this build as there wasn't enough time to flesh out the other characters.

Main Changes and Features:

  • New power ups and abilities:
    • Wall Jump (for Sonic)
    • Golden Shield (gives Sonic the ability to homing attack with a jump dash)
  • An overhaul of layout changes to the following zones:
    • Angel Island
    • Marble Garden
    • Carnival Night
    • Ice Cap
  • Customized bosses for the following levels:
    • Angel Island Act 2
    • Marble Garden Act 2*
    • Carnival Night Act 2
    • Ice Cap Act 2
  • New scripted events added for each of the routes in the levels!
  • New redesign for all seven of the main Special Stages!
  • The same spheres added to the Special Stages (from last bulid):
    • Green Spheres - act as an extra 2-hit sphere, turns into blue spheres when touched.
    • Pink Spheres - transports the player to another random pink sphere on the map.
  • New Sega CD Mode 1 feature that utilizies the Sega CD hardware!
    • At the moment, it only uses the feature of the PCM chip with new high quality sound effects, but more is planned later on, like the graphics chip and CDDA.
    • To know if Sega CD Mode 1 is activated, you should hear a Chao cheer sound effect upon booting up the game.

Minor Changes and Features:

  • New option added to skip Angel Island's intro cutscene by pressing start
  • Unused surfboard intro restored
  • Tails has his own custom intro sequence
  • Palettes to the special stages were altered
  • Title screen has modified text

Emulators tested for Sega CD Mode 1:

  • ClownEmu
  • BlastEmu
  • Ares
  • BizHawk
  • RetroArch

Notes and Misc Information:

  • In downloads, along with the ROM, there are level maps for each of the levels included. Along with this, there is a .cue included, which isn't really needed to activate CD Mode 1, but it's added in case some emulators might need it.
  • The boss(es) in asetricks were the mostly the same bosses from last build, but have tweaks and improvements (i.e. - hitboxes and controls) to improve the exprience.

Non-Changes (From last year's build and from general base game):

  • Bosses from base game not listed remain unchanged along with some of the custom bosses from last build removed
  • Bonus Stages remain unchanged (aside from the additon of the golden shield being added as a gumball power up)
  • Grey Spheres were removed from this build for the Special Stages
  • Save Menu is still unchanged and not included in this build
  • Hydrocity and Launch Base Zone's layouts are unchanged
  • Palettes, Music, and SFX remain unchanged (with the exception of the Special Stages' palette and the main bosses' music)
  • Continue Screen and Lives system unchanged
  • Original HUD text and art is restored to stock vanilla from last build
  • Title Screen and Menus are pretty much the same from last build
  • The Blue Spheres Challenge mode still remains in this build and functions the same way as it did from last build
Credits

Jdpense - Lead Developer & Level Designer

Liliam for thier guide on "Adding Green Sphere to Blue Spheres"

Plutiedev for their guide on setting up with a Sega CD Mode 1 program

S3K Monitor Extended Sprite Sheet by Doc Melonhead & Techokami

Wall Jump sprite from Sonic Crackers

Shield art from Sonic 1

Rumbling sound effect from Sonic 1

Boss music from Sonic 3D Blast

Homing Attack sound effect from Sonic Adventure

Chao sound effect from Sonic Advance 3

bgvanbur for their scdwav2pcm tool

Larry Wall for Perl

The Audacity Team for Audacity

Main Memory for SonLvl

Xenowhirl for SonMapEd

HivePal by Hivebrain

Gallery
Download

File Type: rom/zip

File Size: 1.43 MB

Extra Public Downloads
Level Maps
34.3 MB

mohammedyasir (lavagaming1) @ 2025-10-04 03:28:09

the layout is confusing

Big Mike @ 2025-10-06 03:31:41

There is so much I loveabout this hack. IThe new extensive layouts and the new bosses make this a real gem.That being said unfortunately there is a glitch in the tunnel at the end of AIZ zone in which Sonic will go halfway through, get sent backwards and then get stuck in the wall. Only happened once. Looking forward to playing through as Knuckles and Tails.

RetroKoH @ 2025-10-06 07:47:09

You made a boss fight with the Tornado plane... that alone makes me want to play the absolute $**t out of this hack.