The Definitive Sonic CD Iceberg: Explained
Sonic CD is my favorite Sonic the Hedgehog videogame, and I decided to do this massive iceberg chart!
Thanks @MtbvYT for suggesting me some entries for this iceberg!
There are NO JOKES, every entry has an explanation behind, just pass your cursor over an entry to see the explanation.
Try clicking on some entries to expand them for more details.
Happy 33rd Anniversary, Sonic the Hedgehog CD!
Theory
Rumor
Mystery
In-game content
Glitch/Mistake
Trivia
Beta/Unused content
Unofficial content
Related content
Development-related thing

Blue skies
Two soundtracks
Iconic Opening Themes
Time Stones
Metal Sonic holograms
Amy Rose & Metal Sonic's debut
PC & Gems Collection versions
Debug Mode
Rounds & Zones
Chronological Placement
Sea level
Sonic Origins' controversies
D.A Garden
Round naming pattern
Sonic 1 & 2 parallels
Under the surface
Collision Chaos' secret exit
Different Spin-dash
The Bad Ending is canon
R2 in the Outro cutscene
Why was the OST replaced in the US?
You Say!
Sonic CD in Mega Collection
Shallow waters
Sonic Mania Day
PCM
Unique bosses
Amy's Army
Legit 999 rings in Wacky Workbench
Flowers instead of Animals
Eggman & Sonic monitors in Quartz Quadrant
Cathedral or Statue?
Why was the remake delisted?
Sonic Kills Himself
Metal Sonic is Sonic from a Bad Future timeline
The iceberg's bottom
"US OST is atmospheric"
"US OST is underrated"
Metal Sonic's eye color
Time Travel also affects Never Lake
Pause + A/B/C
CX Room->
Different Drowning "Music"
Only one bottomless pit
Stardust Speedway GF music in the Metal Sonic race
Getting deeper!
2011 Remake Demo
Moon jumps
3D Loop
Amy is from Little Planet
How did Amy get into Little Planet?
Little Planet Past Map
Floating Isles
Dark, dark seas
Inaccessible Pipes
Now Loading...
Sonic Forces Parallels
The “Infinite Fun” screen was meant as an anti-piracy screen
Tidal Tempest buttons minigame
SEGA ordered to re-release this game due to Sonic 4 Ep. 2
Gloomy waters
Little Planet's inhabitants
Deep lore of Little Planet
Little Planet's languages
Supposed Mario cameo
The game was supposed to end in Stardust Speedway
Sonic Mania "Confirms" that the Bad Ending is Canon
US OST Women Chord Fetish
Little Planet's fate
Little Planet is Alive
Metallic Shield's inconsistency
"The 2011 Remake is overrated"
Planned Super Transformation
The abyss
Palmtree Panic Good Future US was meant for the Past
Extended Wacky Workbench GF US part = Original Bad Future track
Quartz Quadrant Bad Future's paradox
US OST represents Sonic's POV
A Second Sonic
Wacky Workbench is being built over Desert Dazzle
TRY AGAIN AND FREE LITTLE PLANET FOREVER
Marianas Trench
Special Stage 6's BG may have killed someone
Sonic kills Eggman in the Bad Ending
Timeline Split Theory
SEGA sabotaged Sonic CD in favor of Sonic 3
Sonic CD has a Psychedelic/Surreal Aura->
Ver0.02 is a Hoax
The Mecha Sonic series was built after Eggman losing Metal Sonic’s blueprints
R2 was removed due to copyright issues
Sonic CD could occur before Sonic 1 without breaking the timeline
Little Planet is Artificial
Sonic CD is trying to warn us from a Real-life Bad Future