You will need a legal copy of the God of War II disc and a BIOS file dumped from your own PS2 console.
Some sites bundle an emulator and a game ROM together. While convenient, downloading ROMs for games you do not own is a violation of copyright laws.
Playing via emulation often allows for higher resolutions (up to 4K), improved frame rates, and save-state functionality that wasn't available on the original hardware. Official God of War Titles on PC
For the safest and best performance, stick to official storefronts for the newer titles or use a reputable emulator like PCSX2 for the classics.
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