What are the titles of every Sonic the Hedgehog game?

As of 2011:

Sonic the Hedgehog

Sonic the Hedgehog 2

Sonic the Hedgehog CD

Sonic Spinball

Sonic the Hedgehog 3

Sonic & Knuckles

Sonic Labyrinth

Sonic 3D Blast (Flickie's Island)

Sonic R

Sonic Adventure

Sonic Pocket Adventure

Sonic Shuffle

Sonic Adventure 2

Sonic Advance

Sonic Advance 2

Sonic Battle

Sonic Heroes

Sonic Advance 3

Shadow the Hedgehog

Sonic Rush

Sonic Riders

Sonic the Hedgehog (2006)

Sonic and the Secret Rings

Sonic Riders Zero Gravity

Sonic Chronicles: The Dark Brotherhood

Sonic Unleashed

Sonic and the Black Knight

Sonic the Hedgehog 4: Episode 1

Sonic Free Riders

Sonic Colours

Sonic Generations