key: 
=100% completion, 
=regular completion, 
=completed with save states
Genesis + Add-Ons
- Sonic the Hedgehog
- Sonic the Hedgehog 2
- Sonic CD
- Sonic the Hedgehog 3 & Knuckles
- Sonic Spinball
- Sonic 3D Blast
- Knuckles Chaotix*
- Dr. Robotnik's Mean Bean Machine
- Sonic Eraser
- Wacky Worlds Creativity Studio**
Game Gear/Master System
- Sonic the Hedgehog
- Sonic the Hedgehog 2
- Sonic Chaos
- Sonic Triple Trouble
- Sonic Spinball
- Sonic Blast
- Sonic Labyrinth
- Sonic Drift
- Sonic Drift 2
- Dr. Robotnik's Mean Bean Machine**
- Tails Adventure
- Tails Skypatrol
Arcade (not counting things like Waku Waku Sonic Patrol Car)
- Sonic the Fighters
- SegaSonic the Hedgehog***
Pico
- Tails and the Music Maker**
- Sonic the Hedgehog's Gameworld**
Saturn
- Sonic R
- Sonic Jam
Dreamcast
- Sonic Adventure
- Sonic Adventure 2
- Sonic Shuffle
GameBoy Advance
- Sonic Advance
- Sonic Advance 2
- Sonic Advance 3
- Sonic Battle
- Sonic Pinball Party**
- Sonic Genesis**
PS2/GCN/Xbox****
- Sonic Heroes
- Shadow the Hedgehog
- Sonic Riders
- Sonic Riders: Zero Gravity
DS
- Sonic Rush
- Sonic Rush Adventure
- Sonic Chronicles: The Dark Brotherhood**
- Sonic Colors**
Xbox 360/PS3/Wii****
- Sonic '06
- Sonic Unleashed
- Sonic Generations
- Sonic Colors
- Sonic and the Secret Rings
- Sonic and the Black Knight
- Sonic Free Riders
PSP
- Sonic Rivals
- Sonic Rivals 2
Wii U/3DS
- Sonic Lost World
- Sonic Boom: Shattered Crystal**
- Sonic Boom: Fire and Ice**
- Sonic Generations
Mobile/PC
- Sonic's Schoolhouse**
- Sonic 4: Episode I
- Sonic 4: Episode II
- Sonic Dash
- Sonic Dash 2: Sonic Boom
- Sonic Jump
- Sonic Jump Fever
- Sonic Runners***
PC/Switch/PS4/Xbone****
- Sonic Mania
- Sonic Forces
- Sonic 4: Episode II
- Sonic Dash
*beaten as Charmy+Heavy
**might skip
***don't know if i'll be able to find a way to play this one
****the games are for the most part multiplatform, with a couple exceptions and a couple cases of extras
note that for the most part ports are left out, excluding ones that i find notably different enough from the original. mario and sonic/all-stars/superstars games are also left out.
other media...
Cartoons
key: =full watchthrough, =sub only (if applicable), =dub only (if applicable)
- Adventures of Sonic the Hedgehog
- Sonic the Hedgehog (SatAM)
- Sonic Underground
- Sonic X
- Sonic OVA
Comics
key: =full comic plus spinoffs (if applicable), =main comic only (if applicable)
- Sonic the Hedgehog (Archie)
- Sonic X (Archie)
- Sonic Boom (Archie)
- Sonic the Comic
- Sonic Promotional Comic
- Sonic the Hedgehog (Manga)
- Dash & Spin: Super Fast Sonic
- Sonic the Hedgehog (IDW)