Sonic Celebrates Birthday With Sonic Generations Demo - Siliconera

Sonic turns 20 years old on June 23 and Sega is handing out a Sonic Generations demo as a party favor. Download it and you can play Green Hill Zone Act 1 with Classic Sonic.

Sonic Generations Demo - Colaboratory

Sonic Generations Gameplay Part 1 - Time Lords and Birthday

References to Sonic in video games - Sonic Retro

News - June, 2011

News - May, 2011

References to Sonic in video games - Sonic Retro

List of cameos and references, Sonic Wiki Zone

News - June, 2011

Samba de Amigo: Party Central - Wikipedia

References to Sonic in video games - Sonic Retro

Cheers to 29 years of collecting - Sonic The Hedgehog

Sonic Generations Part 1: Happy Birthday Sonic!

Celebrating Sonic's Birthday! Sonic Generations Ep.1

Rumour: Sonic The Hedgehog Is Reportedly Set To Become A VTuber