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- Chiki Chiki Boys
- Chili Dog
- Chili Dog Day Afternoon
- Chilly Castle
- ChimpoQ!
- Chip
- Chip McCallahan in Sonic the Hedgehog
- Chip McCallahan in Sonic the Hedgehog 2
- Chirps
- Chocola
- Chocola the Chao
- Choko Kawaguchi
- Choo
- Choopaloo
- Chop Chop
- Chopper
- Chopper (Sonic the Hedgehog 16-bit)
- Chopper (Sonic the Hedgehog 8-bit)
- Chosen One
- Chris
- Chris' Long Journey
- Chris Coffin
- Chris Ebert
- Chris Hernandez
- Chris Senn
- Chris Senn interview by Sega-16 (April 3, 2007)
- Chris Thorndyke
- Chris Turner
- Christian G. Senn
- Christian Senn
- Christian Whitehead
- Christian Whitehead interview by Glixel (September 7, 2017)
- Christina Coffin
- Christina Cooper
- Christmas Island
- Christmas NiGHTS
- Christmas NiGHTS into Dreams
- Christmas Nights
- Christopher Beckford
- Christopher Evan Welch
- Christopher Stephen Welch
- Christopher Welch
- Chroma-Cammo
- Chroma Camo
- Chrome Gadget
- Chrome Gadget Zone
- Chronos Control
- ChuChu Rocket
- ChuChu Rocket!
- Chu Chu Rocket
- Chuck
- Chuck Thorndyke
- Chun-nan
- Chun Li
- Churdle
- Cindy Robinson
- Cinepak
- Cinossu
- Circles Shoot
- Circular Attack
- Circus
- Circus (Sonic Lost World)
- Circus Park
- Circus of Plunders
- City
- City Course
- City Escape
- City Escape (Sonic Generations)
- City Top
- City cliche
- City cliché
- Clam
- Clamer
- Clash!! Sonic VS Knuckles
- Clash!! Sonic vs Knuckles
- Clash! Sonic vs Shadow
- Clash in the Cloister
- Classic Sonic
- Classic Sonic Bundle
- Claxon
- Cliffhanger Flip
- Clock rate
- Clockwork Knight
- Clockwork Knight 2
- Clockwork Pyramid
- Clockwork Zone
- Close Encounter of the Sonic Kind
- Closed Door Policy
- Clothes
- Clothing
- Cloud Sanctuary
- Clove Sea
- ClownMapEd
- Club Air-Edge
- Club Rouge
- Club SEGA
- Club SEGA 2 ~Beat Grooves~
- Club Saturn
- Cluck
- Cluckbird
- Clucker
- Cluckoid
- Coachnik
- Coastal Valley
- Coco Island
- Cocoa Island
- Coconut Crew
- Coconuts
- Coconuts (AoStH)
- Coffin of Memories
- Coffret Sonic
- Coldflame
- Coleco
- Coleco Sonic
- Colleen O'Shaughnessey
- Colleen Villard
- Collision Chaos
- Collision Chaos Zone
- Collision Chaos boss
- Collision index
- Colonel
- Colosseum
- Colosseum Highway
- Colosseum Highway Zone
- Columns
- Columns Crown
- Combat Hover Pod
- Combat Mini-Sub
- Combat Walker
- Combi Catcher
- Combi Confiner
- Combine Ring
- Combot
- Come Out Wherever You Are
- Comic book
- Coming Soon - Sonic Adventure (Arcade, December 1998)
- Coming Soon - Sonic Adventure (Computer & Video Games, April 1999)
- Coming Soon - Sonic Adventure (Computer & Video Games, March 1999)
- Coming Soon - Sonic R (Sega Saturn Magazine, August 1997)
- Coming Soon - Sonic R (Sega Saturn Magazine, October 1997)
- Coming Soon - Sonic the Hedgehog (Sega Players Enjoy Club, Summer 1991)
- Comix Zone
- Commander Abraham Tower
- Commander Brutus
- Commander Syrax
- Commander Walters
- Commodore 64
- Community Hg Project
- Community SVN Project
- Compact disc
- Compact disk
- Comparison of Sega Mega Drive/Genesis Emulators
- Comparison of Sega Mega Drive emulators
- Comparisons
- Compensation for a Miracle
- Compilations which include Sonic the Hedgehog games
- Compile
- Complete Trinity: Sonic Heroes Original Soundtrax
- Complete Trinity Sonic Heroes - Original Soundtrax
- Computer Entertainment Rating Organization
- Concept Art Sketches
- Condor
- Condor (badnik)
- Conductor
- Conner Bringas
- Connor Bringas
- Conquering Sonic Hedgehog 2: An Authorized Guide
- Conquering Sonic the Hedgehog 2: An Authorized Guide
- Console wars
- Containment Rings
- Continue
- Control Pad (Master System)
- Control Stick
- Controller from the Capsule
- Cool Edge
- Cop Speeder
- Copter Combo
- Copy of a Savior?
- Coral Cave
- Corey Bringas
- Corkey
- CoroCoro Fever
- Coronation of Darkness
- Cosmic Angel Zone
- Cosmic Casino Zone
- Cosmic Casino Zone Boss
- Cosmic Crisis
- Cosmic Eternity
- Cosmic Eternity - Believe in Yourself
- Cosmic Fall
- Cosmic Wall
- Cosmic the Hedgehog
- Cosmo
- Countdown to Chaos
- Counter Productive
- Country Crisis
- Courage from Turning Gears
- Cover Feature - Sonic the Hedgehog 3 (Game Players, February 1994)
- Cover Story - Sonic & Knuckles (Mean Machines Sega, October 1994)
- Cover Story - Sonic X-treme (Mean Machines Sega, July 1996)
- Cowbot (episode)
- Crab
- Crab Meat
- Crabmeat
- Crabmeat (Sonic the Hedgehog 16-bit)
- Crabmeat (Sonic the Hedgehog 8-bit)
- Crackers
- Cracking Down
- Cracking Knuckles
- Craig Stait Interview by IceKnight
- Craig Stait interview by ICEknight
- Craig Stitt
- Craig Stitt interview by ICEknight
- Craig Stitt interview by ICEknight (January 2001)
- Crater
- Crawl
- Crawlton
- Cray Castle
- CrazyMrLeo
- CrazySonic
- Crazy Carl
- Crazy Gadget
- Crazy Rush
- Crazy Taxi
- Cream
- Cream Flower Catch
- Cream and Cheese in Sonic the Hedgehog
- Cream the Rabbit
- Creeper Gorge
- Crimson Crater
- Crimson Eye
- Crimson Tower
- Crisis City
- Crisis City (Sonic Generations)
- Croc-Attack
- Crock
- Croesus
- Cross Dozer
- Cross Slash
- Cross the Galaxy Pathway!
- Cruise Blues
- Crush 40
- Crush 40 (Album)
- Crush 40 (album)
- Crush 40 Album
- Cry of the Wolf
- Cryptic Castle
- Crystal Cave
- Crystal Egg
- Crystal Egg Zone
- Crystal Egg Zone boss
- Crystal Frost
- Crystal Head
- Crystal Mountain
- Crystal Mountain Zone
- Crystal Ring
- Crystal of Tragic Knowledge
- Crystallization of Intellect
- 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