If you find a file that is larger—say, —this is a more realistic "Highly Compressed" ISO. These are usually compressed into the .CSO (Compressed ISO) format. They offer the full game with minor sacrifices in loading times but save significant space compared to the 4.7GB original. A true 200MB fully functional ISO is highly unlikely to exist without breaking the game entirely.
In the context of file sharing and ROM compression, "Ultimo" (Spanish/Portuguese for "Ultimate") usually signifies the final, most aggressive version of a compressed file. It implies that the uploader has stripped away every non-essential byte. 200mb God Of War 2 Ps2 Highly Compressed Iso Ultimo