Sonic Adventure marked the transition from 'Classic Sonic' to 'Modern Sonic', as he's often known. The new character design was cooler and meaner, a darker shade of blue and had green eyes.

Shadow the Hedgehog is back with Classic and Modern Sonic in SONIC X SHADOW GENERATIONS, an all-new collection featuring two unique experiences! Play as Shadow the Hedgehog in a brand-new story ...

We’ve known for a long time now that Sonic games largely fall under 2 categories: those set in the classic era, and those in the modern era. For example, games like Sonic Mania and Sonic ...