Focuses on a simple but effective environmental message. Sonic fights to rescue animals that Eggman has kidnapped and turned into robotic "Badniks" to serve as his army.
These offer some of the most expansive and nuanced storytelling, such as the Mobius Encyclopaedia . They explore a darker, dystopian world where a "Freedom Fighters" resistance group battles a version of Robotnik who has already conquered much of the planet. sonic the hedgehog
The "solid" story varies significantly depending on which era or medium you are exploring: Focuses on a simple but effective environmental message