"Extra quality" means offering the best version of each game:
Custom graphics that fill the black bars on widescreen TVs with SNES-themed artwork. all snes roms pack extra quality
Many enthusiasts consider "extra quality" to mean games that have been patched to fix bugs or restore cut content: Can anyone recommend some huge SNES & NES Rom Packs? "Extra quality" means offering the best version of
Early iNES and SNES emulators required specific headers to identify the mapper (memory bank controller). A low-quality ROM might have a "patched" header that causes glitches. Extra quality packs ensure or verified headers that match hash values from the SNES Central database. all snes roms pack extra quality