Sam Jita’s Sonic the Hedgehog Timeline

CLASSIC TIME PERIOD

 * 1) Sonic 3D Blast
 * 2) Sonic Labyrinth
 * 3) Adventures of Sonic the Hedgehog
 * 4) Sonic the Hedgehog Spinball and Tails Skypatrol
 * 5) Sonic CD
 * 6) Sonic Pinball Party
 * 7) Sonic the Hedgehog 3
 * 8) Sonic & Knuckles
 * 9) Sonic Blast
 * 10) Sonic the Hedgehog: Triple Trouble
 * 11) Sonic Mania
 * 12) SegaSonic the Hedgehog
 * 13) Sonic Mania Plus
 * 14) Sonic Mania Adventures
 * 15) Knuckles Chaotix and Sonic Chaos

FIRST PEACEFUL PERIOD

 * 1) Sonic the Fighters
 * 2) Sonic Drift
 * 3) Sonic Drift 2
 * 4) Sonic R

MODERN PERIOD
  
 * 1) Sonic Adventure
 * 2) Sonic Chronicles: The Dark Brotherhood
 * 3) Sonic Adventure 2
 * 4) Sonic Advance
 * 5) Sonic Advance 2
 * 6) Sonic Battle
 * 7) Sonic Advance 3
 * 8) Sonic Rush
 * 9) Sonic Rush Adventure
 * 10) Sonic '06
 * 11) Sonic Generations
 * 12) Shadow the Hedgehog
 * 13) Sonic the Hedgehog and Tails Adventure
 * 14) Sonic the Hedgehog 2
 * 15) Sonic the Hedgehog 4 Episode 1 and Tails and the Music Maker
 * 16) Sonic the Hedgehog 4 Episode 2
 * 17) Sonic X
 * 18) Sonic Unleashed
 * 19) Sonic Colors
 * 20) Sonic Lost World
 * 21) Sonic and the Secret Rings
 * 22) Sonic and the Black Knight
 * 23) Super Smash Brothers
 * 24) Super Smash Bros. 4
 * 25)  Super Smash Bros. Ultimate

EGGMAN REIGN PERIOD (AKA THE ROBOTNIK RULE PERIOD)

 * 1) Sonic Forces
 * 2) Sonic comics by IDW Publishing
 * 3) Sonic the Hedgehog (aka "Sonic Sat.A.M.")

SECOND PEACEFUL PERIOD

 * 1) Sonic Runners
 * 2) Sonic Free Riders
 * 3) Sonic Free Riders: Zero Gravity
 * 4) Sonic Shuffle
 * 5) Sega Superstars
 * 6) Sega Superstar Tennis
 * 7) Sonic and SEGA: All-Stars Racing
 * 8) Sonic and SEGA: All-Stars Racing: Transformed
 * 9) Sonic Team Racing
 * 10) Sonic Team Racing: Overtime

Underground Timeline

 * 1) Sonic Underground
 * 2) Sonic Underground (LCD Game)