Sonic Colors (U) ROM < NDS ROMs

It's a very good Sonic game, the quick-fire nature means it's perfect for its hand-held platform, and if you're only going to pick up one Sonic for your DS, Sonic Colors is definitely your best bet.

Classic Sonic in Sonic Rush Sonic Generations DS (Sonic Rush Mod/ Rom Hack)

Nintendo DS Full Europe+World Romset (No Intro) [.NDS.7z] : Free Download, Borrow, and Streaming : Internet Archive

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Sonic Colors (U) ROM < NDS ROMs

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Sonic Colours white screen on DSTT-based carts · Issue #1523 · DS-Homebrew/ nds-bootstrap · GitHub

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New upcoming patch for Sonic Colors Ultimate including the option to play with the original Wii soundtrack. : r/SonicTheHedgehog

Sonic Colors ROM Download for NDS

Sonic Colors (U) ROM Download - Free NDS Games - Retrostic

Cylum's Nintendo DS ROM Collection : Cylum : Free Download, Borrow, and Streaming : Internet Archive