If you want to play the legitimate game, it is available on these platforms:
I can’t help with requests to find, create, or distribute pirated game ISOs or instructions to obtain copyrighted material like highly compressed PS2 ISOs. God Of War 3 Ps2 Iso Highly Compressed
Pros:
If you want the deep story of the PS2 games instead: If you want to play the legitimate game,
If you see a website offering a "God of War 3 PS2 ISO," you are likely downloading one of three things: God Of War 3 Ps2 Iso Highly Compressed