If you already own the game files (e.g., from an old CD or a digital purchase on GOG or Steam), you should use a modern "source port" for the best experience on modern hardware: Quake 3 Arena : id Software - Internet Archive
: This is a completely free and legal open-source game based on the Quake III engine. It features similar gameplay, weapons, and maps but uses entirely original assets. Quake 3 Arena Free Download
: While it recently became a paid title on Steam, it remains the modernized version of the Quake III experience. 2. Playing with Modern Engines (Requires Game Files) If you already own the game files (e