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- Cube
- Cubot
- Cucky
- CulTNET
- CulT IRC
- Cure Master
- Curien Mansion
- Curling Holiday
- Curse Opal
- Curse of the Cross Eyed Moose
- Custom Hero
- Cuts Unleashed SA2 Vocal Collection
- Cutthroat Cove
- Cutting Edge - Sega Unveils Sonic Adventure (Edge, October 1998)
- Cyber City
- Cyber City Zone
- Cyber Corruption
- Cyber Space
- Cyber Station Zone
- Cyber Station Zone boss
- Cyber Track
- Cyber Track Boss
- Cyber Track Zone
- Cyber Track Zone Boss
- Cyberdyne Systems Mobius
- Cybersound
- Cyblaster
- Cyclone
- Cyclone (Sonic Adventure 2)
- Cyclone (Sonic Chronicles)
- Cyclone (Sonic Drift)
- Cyclone (Walker)
- Cyclone (spacecraft)
- Cyclone (spaceship)
- Cyclone Boost
- Cyclone Cannon
- Cyclone Kick
- Cyhammer
- Cyknuckle
- Cyko Vision
- Cyloop
- Cyrus
- D-Fekt
- DB-9
- DCT
- DCZ
- DDZ
- DD Wrecker
- DE-9
- DEZ
- DGen
- DHZ
- DJCTQ
- DLZ
- DPZ
- DREAMS COME TRUE
- DS
- DS stylus
- DWEA
- DX
- DXEdit
- DYZ
- Dai Rantou Smash Brothers X
- Daikun
- Dairantou Smash Brothers for Wii U
- Daisuke Mori
- Daisuke Ono
- Daisuke Saito
- Daisy
- Daizaburou Sakurai
- Daizo Kinoshita
- Dalek Team
- Dan Drazen
- Dan Green
- Dan Nakrosis
- Dangerous Ball Tower
- Dangerous Ball Tower (Sonic Mania Boss)
- Dangerous Ball Tower (Sonic Mania boss)
- Dango
- Danica Patrick
- Daniel Barnes
- Danny
- Danny Parker interview by Dennis Spielman
- Dark Arsenal
- Dark Arsenal (Team Sonic Racing)
- Dark Bat
- Dark Bat Sniper
- Dark Bat Thunder
- Dark Castle
- Dark Castle Area
- Dark Chao
- Dark Chao Walker
- Dark Dash
- Dark Desert
- Dark Destroyer
- Dark Eel
- Dark Energy Force Field
- Dark Energy Key
- Dark Finale
- Dark Finish
- Dark Fright
- Dark Gaia
- Dark Gaia's Minions
- Dark Gaia Force
- Dark Gaia Phoenix
- Dark Gaia minion
- Dark Gaia minions
- Dark Guardian
- Dark Hegemony
- Dark Hollow
- Dark Master
- Dark Moray
- Dark Oak
- Dark Queen
- Dark Reaper
- Dark Soldier
- Dark Sonic
- Dark Super Sonic
- Dark Valley
- Dark Warrior’s Advent
- Dark empire
- Darkness’ Conspiracy
- Darkness’ Strongest Soldier
- Darkspine Sonic
- Darren Dunstan
- Darts Shot
- Dash & Spin
- Dash & Spin Chousoku Sonic
- Dash Panel
- Data Discs
- Datel
- Dave B. Mitchell
- Dave Manak
- Dave Mitchell
- Dave Sanner
- David
- David Gonterman
- David Humphrey
- David Javelosa
- David Javelosa interview by Sega-16 (July 2, 2008)
- David Keefer
- David Mariotte
- David Rosen
- David Willis
- David Wills
- Davy Sprocket
- Dawn of the Machines
- Day of Disaster
- Daytona USA
- Dead Line
- Dead Line (Sonic Rush)
- Dead Line Zone
- Dead Line boss
- Deadly Route
- Deadly Six
- DeanSatan
- Dean Lester
- Dean Ruggles
- Dean Sitton
- Dear Father
- Dear My Friend
- Death Ball
- Death Chamber
- Death Crab
- Death Egg
- Death Egg's Eye
- Death Egg's Hangar
- Death Egg (ASR)
- Death Egg (Death Egg Zone boss)
- Death Egg (S&K)
- Death Egg (Sonic Battle)
- Death Egg (Sonic Drift 2)
- Death Egg (Sonic Forces)
- Death Egg (disambiguation)
- Death Egg 2
- Death Egg II
- Death Egg Robot
- Death Egg Robot (Sonic Forces boss)
- Death Egg Robot (Sonic Generations boss)
- Death Egg Robot (Sonic Mania boss)
- Death Egg Robot (Sonic the Hedgehog 4 boss)
- Death Egg Saga
- Death Egg Zone
- Death Egg Zone (S&K)
- Death Egg Zone (S2)
- Death Egg Zone (SK)
- Death Egg Zone (Sonic & Knuckles)
- Death Egg cliché
- Death Egg mk.II
- Death Egg mk.II Zone
- Death Egg mk.II Zone Boss
- Death Leech
- Death Queen
- Death Ruins
- Death Worm
- Death Yard
- Death Yard Zone
- Deathcalibur
- Deborah McCracken
- DebuGens
- Debug
- Debug Mode
- Debug mode
- Debugens
- Decap Attack
- Decisive Battle! Dark Oak
- Decisive Battle on the Equator!!
- Decoe
- Decoe & Bocoe
- Decoe and Bocoe
- Deem Bristow
- Deep Black
- Deep Core
- Deep Nightmare
- Deep Power Stones
- Deep Typhoon
- Deep Woods
- Deeper
- Defective Detectives
- Deith Leisure
- Deletite
- Delta
- Demigod
- Demise Wrought by Tragedy
- Demo - Sonic Spinball (Ação Games)
- Denizen 1998
- Departamento de Justiça, Classificação, Títulos e Qualificação
- Department of Justice, Rating, Titles and Qualification
- Departure! Egg Fort II
- Depths of Danger
- Derek Allen
- Desert Cliche
- Desert Dazzle
- Desert Dodge
- Desert Palace
- Desert Palace Zone
- Desert Road
- Desert Ruins
- Desert Ruins (Sonic Lost World 3DS)
- Desert Ruins (Sonic Runners)
- Desert Zone
- Desert cliché
- Desert level
- Designated Heroes
- Despair’s Quickening
- Desperately Seeking Sonic
- Desperately Seeking Sonic (Grosset & Dunlap book)
- Dessert Ruins
- Destiny for Two
- Destruction From Perfection
- Destruction and Scorn
- Determination of a Fake
- Determination’s Daybreak
- Detritus Desert
- Deven Mack
- Devil's Details
- Devil Doom
- DiC
- DiC Entertainment
- Diablon
- Diabolical Power
- Diamond Cutters
- Diamond Dust
- Diamond Dust Zone
- Diamond Dust Zone Badnik 1
- Diamond Dust Zone Badnik 2
- Diamond Dust Zone Badnik 3
- Diamond Dust Zone boss
- Diamond in the Sky
- Diane A. Fornasier
- Dick Tracy
- Didj
- Diff (utility)
- Dig
- Digibase
- Digibase Operations
- Digital Circuit
- Digital Dimension
- Digital Eclipse
- Dilapidated way
- Dimension Ring
- Dimps
- Dingo
- Dino Mountain
- Dinobot
- Dinosaur Jungle
- DirectLink
- Disappointed in Humanity
- Disassembler
- Disassemblies
- Disassembly
- Disc
- Disciple from the Darkness
- Discussion with Friends
- Distorted Truth
- Dive Bat
- Dive Eggman
- Dive Into The Mellow
- Dive into the Mellow
- Do Not Disturb
- Doctor's Mine
- Doctor Eggman
- Doctor Eggman/Robotnik
- Doctor Fukurokov
- Doctor Ivo "Eggman" Robotnik
- Doctor Ivo Robotnik
- Doctor Ivo Robotnik (Sonic the Comic)
- Doctor Robotnik
- Doctor Robotnik's Creature Capture
- Doctor Robotnik's Mean Bean Machine
- Doctor Zachary
- Dodon Pa
- Dohyo Master
- Dokabuton
- Dolphin Resort
- Dome Sweet Dome
- Don't Judge Me
- Don't Make Me Angry
- Don Fachio
- Don Goddard
- Don Goddard Game Script
- Don Goddard Sonic 32X game script
- Don Goddard interview by hxc/Part One
- Don Goddard interview by hxc - Part One (May 2008)
- Dong Gu Ri Te Chi Jak Jeon
- Donna De Lory
- Donna Jay Fulks
- Donut Lord
- Doodlebug Mecha
- Doom's Eye
- Doomsday
- Doomsday Zone
- Dorian Kieken
- Dorian Kieken interview by PALGN (September 6, 2008)
- Dorigame
- Double-word
- Double Boost
- Double Doomsday
- Double Pack: Sonic Advance & ChuChu Rocket!
- Double Pack: Sonic Battle & Sonic Advance
- Double Pack: Sonic Pinball Party & Sonic Battle
- Double Rivals Attack Pack
- Double Rivals Attack Pack!
- Double Spin Attack
- Double Trouble