https://wccftech.com/grand-theft-auto-iii-unofficial-nintendo-switch-port/

Grand Theft Auto III has been ported to Nintendo Switch, and this unofficial port does seem to run well on the console.

This port, which requires a modded Switch running a custom firmware, has been showcased by a new video shared Eradicatinglove. The port runs at 1080p, 30 FPS in docked mode, 720p, 30 FPS in handheld mode, and has some trouble handling audio without causing performance issues, but it is still impressive, considering it is not an official release.