The most straightforward and legal method to play Sonic The Hedgehog (2006) is to purchase it from official channels:
"Revisiting a Blast from the Past: A Guide to Downloading Sonic The Hedgehog (2006) Xbox 360 ISO" Sonic The Hedgehog 2006 Xbox 360 Iso Download
There are several reasons why fans might want to download the Sonic The Hedgehog 2006 Xbox 360 ISO: The most straightforward and legal method to play