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It was one of the first CD-ROM-only games that was furthermore a complete new development for that media and not only a port of another version such as an already existing floppy disc game or a laserdisc arcade machine.
One of the first or even the first? I'm not sure. The CD-ROM version of The_Manhole was also released 1989. I don't know exactly which game was first. But the Manhole was also only a port of an already existing floppy disc game from 1988 with the same name.