Many PS2 ISOs range from 1–4 GB, but a surprising number of classics fit into under 500 MB . These are perfect for low-capacity SD cards, FAT32 USB drives, or budget emulation handhelds (e.g., PS Vita, low-end Android, or TrimUI Smart Pro).
⭐ – Don’t let “small size” fool you; these games play just as well as 4GB titles. Best for: Retro handhelds, USB loading on real PS2, or saving SSD space. Avoid if: You want open-world games or CGI-heavy stories.
While these are technically "larger" for this list, they are still tiny compared to modern games. Because the songs are midi-based (recorded covers, not uncompressed audio), the only real storage hog is the character models. You can fit both Guitar Hero games on a single 1GB USB drive.