There is a holy grail in the world of retro gaming collecting. It isn't a loose cartridge of EarthBound or a sealed copy of Super Mario Bros. It is the complete SNK Neo Geo MVS library.
While downloading a "Full Set" of 181 games is copyright infringement unless you own the original cartridges, there is a silver lining: Many of these games are no longer in active commercial circulation. The only way to play Zupapa! or Bang Bang Busters today without spending $1,000+ is through emulation. Neo Geo Roms Full Set 181 Games Download
~4.5 GB (Compressed) Best Emulator: FinalBurn Neo Hidden Gem: Twinkle Star Sprites (A competitive Puyo-Puyo meets shooter hybrid) There is a holy grail in the world