Since "patched" files are rare and often broken, the best approach is making your own. Here is the simplified workflow to shrink a game close to 100MB (usually 300MB-500MB is the actual floor for playable games).
The PlayStation 2 natively reads discs containing roughly 4.7GB (DVD-5) or 8.5GB (DVD-9) of data. So, the idea of squeezing a full game into a file smaller than a 3-minute MP3 song (under 100MB) seems impossible. Yet, these files exist in certain corners of the internet. Here’s the reality behind them. ps2 iso highly compressed under 100mb patched
Legitimate small PS2 content (under 100MB) is virtually nonexistent except for: Since "patched" files are rare and often broken,
Certain PS2 utility discs (like HD Loader, uLaunchELF) are under 100MB and are legally distributable as they contain no copyrighted game code. Certain PS2 utility discs (like HD Loader, uLaunchELF)
Distributing or downloading these compressed, patched ISOs almost always violates copyright law, as they contain copyrighted code and assets. Additionally, from a preservation standpoint, a 100MB “patch” is typically a butchered shadow of the original game—unplayable for any meaningful experience.