Sonic X-treme

Console
Sonic The Hedgehog (1991) | 2 | CD | 3 | Sonic & Knuckles | 3D Blast | Adventure | Adventure 2 | Heroes | Sonic the Hedgehog (2006) | Unleashed | 4: Episode I | Colors | Generations | 4: Episode II | Lost World | Mania | Forces

Handheld
Sonic the Hedgehog | 2 | Chaos | Triple Trouble | Blast | Pocket Adventure | Advance | Advance 2 | Advance 3 | Rush | Rush Adventure

Spin-offs

Platformers

Sonic Boom
Rise of Lyric | Shattered Crystal | Fire & Ice

Other
Knuckles' Chaotix | Tails Adventure | Shadow the Hedgehog | Rivals | Secret Rings | Rivals 2 | Black Knight

Racing
Drift | Drift 2 | R | Riders | Riders: Zero Gravity | All-Stars Racing | Free Riders | All-Stars Racing Transformed | Team Sonic Racing

Mario & Sonic
Mario & Sonic at the Olympic Games | Olympic Winter Games | London 2012 Olympic Games | Sochi 2014 Olympic Winter Games | Rio 2016 Olympic Games

Mobile
Jump (Fever) | Dash | 2: Sonic Boom | Runners | Runners Adventure

Other
SegaSonic the Hedgehog | Spinball | Dr. Robotnik's Mean Bean Machine | Sonic Labyrinth | Sonic the Fighters | Sonic Shuffle | Pinball Party | Battle | Chronicles: The Dark Brotherhood

Cancelled games
Sonic X-treme

Animation
Adventures of Sonic | Sonic the Hedgehog (TV series) | OVA | Underground | X | Boom | Feature Film

Printed media
Sonic the Hedgehog (Archie Comics) | Sonic the Hedgehog (IDW Publishing)