Grand Theft Auto: Iii -3- V1.1 Multi10 - Elamigos

No. GTA III is single-player only.

Yes. Mods for GTA III v1.1 work fine. Avoid Steam/Definitive Edition mods. Grand Theft Auto III -3- v1.1 MULTI10 - ElAmigos

Yes, but you will need compatibility fixes (SilentPatch + dgVoodoo2). Grand Theft Auto III -3- v1.1 MULTI10 - ElAmigos