Sonic: Unleashed cover or packaging material - MobyGames

Sonic Advance - Wikipedia

Sonic Colours (EU) ROM Download - Nintendo DS(NDS)

5369 - Sonic Colors (USA) Nintendo DS (NDS) ROM Download - RomUlation

Sonic Rush Adventure (Nintendo DS)

Fun Fact: Did you know there's a mobile Sonic Unleashed game : r/SonicTheHedgehog

The Alternative Version of Sonic Colors

DS / DSi - Sonic Colors - Sonic the Hedgehog - The Models Resource

In the 1990s, a Sonic/Mario game launching the same day would have

Sonic doesn't care about copyright laws. : r/SonicTheHedgehog

Sonic Colors Nds Level Background In Sonic 3 Air by Angry Sun Gaming - Game Jolt