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- RSVE8P
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- RT5E8P
- RT5P
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- RVZ
- RVZ Badnik
- RWSE
- RWSE8P
- RWSJ
- RWSJ01
- RWSK
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- RWSP8P
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- RXL Format
- Rabbit
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- Race of AGES
- Race to Win
- Rachel
- Racing
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- RadPal
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- Radial Burst
- Radiant Emerald
- Radica
- Radical City
- Radical Highway
- Radical Highway (Sonic Generations 3DS)
- Radical Train
- Radu
- Rafa Knight
- Rafael Alonso Naranjo Jr.
- RagnaBot
- Ragna Rock
- Rail Canyon
- Rail Canyon (Shadow Generations)
- Rail Canyon (Sonic Heroes)
- Rail Canyon (Tails' Skypatrol)
- Rail Canyon (program)
- Rail Canyon Area
- Rainbow Ring
- Rainy Savanna
- Rampart Road
- RandomSonicNet
- Random Sonic Net
- Rank
- Rapid Climb
- Rapid Crab
- Rapid Fire Unit
- Rapid Tails Attack
- Rat.org
- Ratman221
- Rattlekiller
- Rava the Destroyer
- Rave - Sonic the Hedgehog (Raze, September 1991)
- Ray
- Ray Muzyka
- Ray Muzyka interview by CVG (May 12, 2008)
- Ray in Sonic 1
- Ray the Flying Squirrel
- Ray the Flying Squirrel in Sonic the Hedgehog
- Ray the Squirrel
- Rchan
- Rchannel
- Reach For The Stars
- Reach for the Stars
- Reactive Factory
- Ready to Role (Nintendo Power, February 2008)
- RealOne Arcade
- Realization While On Board
- Really Amateur Games Expo
- Realtime Associates
- Rebecca Handler
- Rebecca Honig
- Rebel Rouge
- Reborn Along with Sorrow
- Reborn Hatred for Humanity
- Reclaimed Heart
- Recovery Smash
- Red Barrier
- Red Canyon
- Red Deep Nightmare
- Red Eye
- Red Fright
- Red Fruit
- Red Gate Bridge
- Red Hot Sonic 2
- Red Killer Bee
- Red Mountain
- Red Nightmare
- Red Orbs
- Red Pillar
- Red Pine
- Red Rex
- Red Rings
- Red Sands
- Red Shield
- Red Star Ring
- Red Titan
- Red Volcano Zone
- Red Volcano Zone boss
- Red Wisps
- Redemption game
- Redlocks
- Reducite
- Redz
- References to Sonic
- References to Sonic in art
- References to Sonic in film and television
- References to Sonic in medicine
- References to Sonic in militaries
- References to Sonic in music
- References to Sonic in print
- References to Sonic in sports
- References to Sonic in video games
- References to Sonic on the internet
- Refreshinator
- Regal Ruin
- Regen
- Regional lockout
- Reiko Kodama
- Relief
- Reloaded Mod Loader
- Remix Factory
- Remote Robot
- Renato Novara
- Renegade Knucks
- Renzoku Bound
- Replica’s Depression
- Requiem for a Fallen Angel
- Requiem for the Heavens
- Rescue Rings - Sonic the Hedgehog (Video Games, February 1991)
- Researcher
- Resolution
- Resort Island
- Retribution Against Humanity
- Retro-Orbital Chaos Compressor
- RetroDrive
- RetroHack
- Retro Channel
- Retro Engine
- Retro Engine (engine)
- Retro Sonic
- Retro Sonic Nexus
- Retrocast
- Retrodrive
- Retrohack
- Return of the Buddy Buddy Temple of Doom
- Return to Beyond the Valley of the Cubots
- Revenge Upon the Doctor
- Revenge and Determination
- Revenge at Last
- Revenge of the Robot
- Reverse engineering
- Review - Chaotix (Sega Magazine, 1995)
- Review - Dr. Robotnik's Mean Bean Machine (Mean Machines Sega, May 1994)
- Review - Dr. Robotnik's Mean Bean Machine (MegaZone, January 1994)
- Review - Dr. Robotnik's Mean Bean Machine (Sega Magazin)
- Review - Knuckles' Chaotix (Sega Magazine, 1995)
- Review - Sonic & Knuckles (GamePro, November 1994)
- Review - Sonic & Knuckles (MegaZone, October 1994)
- Review - Sonic & Knuckles (Sega Magazine, 1994)
- Review - Sonic & Knuckles (Sega Magazine, October 1994)
- Review - Sonic & Knuckles (Sega Megazone, October 1994)
- Review - Sonic 3D Blast (GamePro, December 1996)
- Review - Sonic 3D Blast (Hyper, May 1997)
- Review - Sonic 3D Flickies' Island (Mean Machines Sega)
- Review - Sonic 3 (Hyper, March 1994)
- Review - Sonic 3 (SEGA Magazine, February 1994)
- Review - Sonic Adventure (Computer & Video Games, October 1999)
- Review - Sonic Adventure (Official Dreamcast Magazine, September 1999)
- Review - Sonic Chaos (MegaZone, November 1993)
- Review - Sonic Chaos (Megaforce, November 1993)
- Review - Sonic Drift 2 (Mean Machines Sega, November 1995)
- Review - Sonic Heroes (Official Xbox Magazine, February 2004)
- Review - Sonic Jam (GamePro, November 1997)
- Review - Sonic Jam (Sega Saturn Magazine, August 1997)
- Review - Sonic R (Computer and Video Games, December 1997)
- Review - Sonic R (Electronic Gaming Monthly, February 1998)
- Review - Sonic R (GamePro, February 1998)
- Review - Sonic R (Sega Saturn Magazine, December 1997)
- Review - Sonic Spinball (Electronic Gaming Monthly, December 1993)
- Review - Sonic Spinball (Mean Machines Sega, October 1994)
- Review - Sonic Spinball (MegaTech)
- Review - Sonic The Hedgehog 2 (Mean Machines Sega, November 1992)
- Review - Sonic Triple Trouble (Sega Visions, October 1994)
- Review - Sonic the Hedgehog (GamePro, February 1992)
- Review - Sonic the Hedgehog (Mean Machines, July 1991)
- Review - Sonic the Hedgehog (Raze, September 1991)
- Review - Sonic the Hedgehog 2 (8-bit) (Mean Machines Sega, November 1992)
- Review - Sonic the Hedgehog 2 (Consoles Plus, October 1992)
- Review - Sonic the Hedgehog 2 (Electronic Gaming Monthly, December 1992)
- Review - Sonic the Hedgehog 2 (GamePro, March 1993)
- Review - Sonic the Hedgehog 2 (Mean Machines Sega, November 1992)
- Review - Sonic the Hedgehog 2 (Mega, November 1992)
- Review - Sonic the Hedgehog 2 (Megaforce, January 1993)
- Review - Sonic the Hedgehog 2 (Megazone, January 1993)
- Review - Sonic the Hedgehog 2 (Sega MegaZone, January 1993)
- Review - Sonic the Hedgehog CD (Electronic Gaming Monthly, November 1993)
- Review - Sonic the Hedgehog CD (GamePro, January 1994)
- Review - Sonic the Hedgehog CD (Mean Machines Sega, November 1993)
- Review - Sonic the Hedgehog CD (Megaforce, November 1993)
- Review - Sonic the Hedgehog CD (Sega Magazin)
- Review Crew - Sonic Heroes (Electronic Gaming Monthly)
- Review Crew - Sonic the Hedgehog 2 (Electronic Gaming Monthly, December 1992)
- Review Crew - Sonic the Hedgehog CD (Electronic Gaming Monthly, November 1993)
- Review This! - Sonic Triple Trouble (Sega Visions, October 1994)
- Reviews-Genesis - Sonic the Hedgehog (Sega Visions, May 1992)
- Reviews - Sonic Colours (Nintendo Power, December 2010)
- Reviews - Sonic Colours (Official Nintendo Magazine, November 2010)
- Reviews - Sonic Heroes (PlayStation Magazine, February 2004)
- Reviews - Sonic Heroes (Playstation Magazine, February 2004)
- Reviews - Sonic Shuffle (Hyper)
- Reviews - Sonic the Hedgehog 2 (GamesMaster, January 1993)
- Revolving Hammer Attack
- Revvin' Up
- Rex
- Rexon
- Rexxon
- Rez
- Rhea Island
- RhinoBot
- Rhino Cannon
- Rhino Jet
- Rhino Liner
- Rhino Metal
- Rhino Spike
- Rhino series
- Rhinobot
- Rhinotank
- Rhythm And Balance
- Rhythm Badge
- Rhythm and Balance
- Riadne
- Ribot
- Rich Koslowski
- Rich Ring
- Richard Elson
- Richard Goldwater
- Richard Jacques
- Richard Wheeler
- Rick Wheeler
- Ricky
- Ridal Tap
- Ridicule Root
- Rieko Kodama
- Rimlight
- Rimlight Corporation
- Ring
- Ring Energy
- Ring Gate
- Ring Lasso
- Ring Magnet
- Ring Racers
- Ring Rolling
- Ring Spark Field
- Ring Tide
- Ring monitor
- Ring of Fire
- Ringidium
- Ringleader
- Rings
- Riot Train
- Rip 'n' Tip - Sonic the Hedgehog 2 (Mega, December 1992)
- Rip N Tip - Sonic the Hedgehog 2 (Mega, December 1992)
- Rise Again
- Rise of the Machine Kingdom
- Ristar
- Ristar (16-bit)
- Ristar (Genesis)
- Ristar Cluster
- Riu Konaka
- Riyu Konaka
- Road Dragoon
- Road Hog
- Road Rock
- Road of the Dark Soldier
- Rob Corona
- Rob Cypher
- Rob Northen compression
- Robert Morgan
- Robert Steele
- Robert White
- Roberto Corona
- Robo-Boiler
- Robo-Ninjas
- Robo Kukku
- Robolympics
- Robot Battle Royale
- Robot Carnival
- Robot Employees
- Robot Frog
- Robot Storm
- Robot teleporter
- Robot transporter
- Roboticization
- Roboticizer
- Robotization
- Robotizer
- Robotniik's Revenge
- Robotnik
- Robotnik's Pyramid Scheme
- Robotnik's Revenge
- Robotnik's Revenge (Sonic X episode)
- Robotnik's Rival
- Robotnik's Ship
- Robotnik's Ship (Sonic Spinball)
- Robotnik's ship (Sonic Spinball)
- Robotnik, Jr.
- Robotnik (Bridge Zone Boss)
- Robotnik (Bridge Zone boss)
- Robotnik (Collision Chaos Boss)
- Robotnik (Collision Chaos boss)
- Robotnik (Crystal Egg Zone Boss)
- Robotnik (Crystal Egg Zone boss)
- Robotnik (Electric Egg Zone Boss)
- Robotnik (Electric Egg Zone boss)
- Robotnik (Green Hill Zone Boss)
- Robotnik (Green Hill Zone Boss 8-bit)
- Robotnik (Green Hill Zone boss)
- Robotnik (Jungle Zone Boss)
- Robotnik (Jungle Zone boss)
- Robotnik (Labyrinth Zone Boss)
- Robotnik (Labyrinth Zone Boss 8-bit)
- Robotnik (Labyrinth Zone boss)
- Robotnik (Marble Zone Boss)
- Robotnik (Marble Zone boss)
- Robotnik (Metallic Madness Boss)
- Robotnik (Metallic Madness boss)
- Robotnik (Quartz Quadrant Boss)
- Robotnik (Quartz Quadrant boss)
- Robotnik (Sky Base Zone Boss)
- Robotnik (Sky Base Zone boss)
- Robotnik (Spring Yard Zone Boss)
- Robotnik (Spring Yard Zone boss)