Have a machine dedicated to gaming, no Internet access, with a swappable SSD. Make a clean OS install. Clone it to an external backup drive, then disconnect the backup. Install and play. If you want to play another game, format the drive, clone the OS from the external backup, install and play. If you want to play multiple games, have them on different SSD drives.
Have a machine dedicated to gaming, no Internet access, with a swappable SSD. Make a clean OS install. Clone it to an external backup drive, then disconnect the backup. Install and play. If you want to play another game, format the drive, clone the OS from the external backup, install and play. If you want to play multiple games, have them on different SSD drives.
It’s hardware sandboxing.