While the Nintendo DS hardware was largely region-free, allowing cartridges from any region to be played, the localization of text and audio remained a significant production cost. "Spanish Packs" refer to curated collections where the included ROMs are specifically the European (EUR) or occasionally North American (USA) releases that feature Spanish language options. This curation requires knowledge of scene release numbers and internal header flags to ensure the correct regional version is included.
: Sources like the Internet Archive are generally considered the safest and most reliable for preserved "No-Intro" sets, which match original cartridge data exactly. Recommended Games to Look For (Spanish Available) roms nds espanol pack link