If you encounter a website or a YouTube video offering a "God of War 3 PS2 ISO Highly Compressed 50MB" or similar, you are likely looking at one of three things:
You can play the original 2010 release using a physical disc or a digital copy on a PS3 console. PlayStation 4 Go to product viewer dialog for this item. God Of War 3 Ps2 Iso Highly Compressed
However, before you click another sketchy download link or watch a sketchy setup tutorial, there is a massive technical reality check you need to know: Why God of War 3 Does Not Exist on PS2 If you encounter a website or a YouTube