I understand the appeal of small file sizes, but I must give you a clear, honest answer upfront:
Standard ZIP files are not powerful enough. Instead, these games are packed using maximum compression algorithms via 7-Zip (.7z) or WinRAR (.rar) , which compress repetitive code down to a fraction of its size. Best Highly Compressed PS2 Games Under 100MB
This is the gray area.
Note: Sizes vary by source and compression method (CSO, ZSO, or CHD).
These are the heavy hitters, games you wouldn't expect to ever be under 100MB. Community-made "Lite" or "RIP" versions strip them down to their bare essentials for pure gameplay. Highly Compressed Ps2 Games Under 100mb
Do not try to load a .7z or .rar file directly into the emulator if it is heavily compressed.
: A budget sports title with a minimal footprint of approximately . 10 Pin Champions Alley : A bowling game that fits within 50MB . Action Man: A.T.O.M. I understand the appeal of small file sizes,
The Ultimate Guide to Highly Compressed PS2 Games Under 100MB
: Many titles in the Sega Ages or Capcom Classics collections are extremely lightweight once removed from their disc-padding "dummy" files. How High Compression Works for PS2 Note: Sizes vary by source and compression method
Many PS2 games contain "dummy data"—essentially blank data padding used by developers to fill up physical disc space. Read lasers on original PS2 consoles read data faster when it was pushed to the outer edges of the disc. By using specialized tools to strip out these useless gigabytes of blank data, the actual core game files are revealed to be much smaller than the original ISO container. 2. High-Ratio Compression Formats