If you're determined to track down a specific 620-in-1 compilation for nostalgia's sake, resources like Archive.org and specialized ROM forums are your best starting points. Just be aware of the legal implications and proceed with appropriate caution.
Some websites hosting this file bundle the ROM with a virus or a custom "installer." Never download an executable file claiming to be the ROM. The file should be a .nes or .zip only. 620 In-1 Nes Rom Download
Unlicensed games that were never released in the West. Where to Download the ROMs If you're determined to track down a specific
Includes the "Big Three": Super Mario Bros. , Contra , and Tetris . Top Games Included in the Collection The file should be a
Contrary to what the title might suggest, these cartridges rarely contain 620 unique high-quality titles. Instead, they feature a mix of popular classics, numerous hacks (hacked versions of games with modified graphics or difficulty), and various international variations of games.
Search for "620 in 1 NES ROM" or "NES multicaart rom" on specialized ROM hosting platforms.
For those who want to play on original hardware, a Flash Cart (like the EverDrive-N8 ) can be loaded with the 620-in-1 ROM and inserted into an actual NES console. The Legal and Ethical Context of ROMs