Must play games list

So I'm delving back into the realm of PS2 and am wanting to hear from others what their must play games are.

Main reason for this is because I've recently become very interested in the newer god of war games but before I play them I want to play the og series as I've never played them.

I've never really been able to get into rpg games but if enough people recommend a certain title I will look into it.

Also I've played the GTA games and love them so if it makes it easy for everyone there's no need to include them in your recommendations.

Outside of that go nuts lol