Many sites claiming to host 50 GB games (like GTA V or Call of Duty) compressed to 10 MB often contain adware or trojans .
Collections of original 8-bit or 16-bit ROMs (like NES or Game Boy games) are naturally small, often under 50 KB each, allowing hundreds to fit into a single megabyte. Top Highly Compressed Games & Packs Under 10 MB new 1000 games highly compressed 10 mb work
MAME can run thousands of classic arcade ROMs. A curated “MAME 0.78 ROM set” for 500 games is roughly 200MB compressed. Install the mame.exe (2MB) and load ROMs from safe archives. Many sites claiming to host 50 GB games