This is a revision of Tantei Jinguuji Saburou - Shinjuku Chuuou Kouen Satsujin Jiken released for the NES Disk Writer.  The 'Rev 1' designation indicates a later version of the game, potentially with bug fixes or minor gameplay improvements.  The Disk Writer format offers more storage than standard cartridges, potentially resulting in a more complex investigation with enhanced graphics or sound, or a more detailed story.  Information about the specific nature of the revisions and the developers is scarce.

Tantei Jinguuji Saburou - Shinjuku Chuuou Kouen Satsujin Jiken (Japan) (Rev 1) (Disk Writer)

Tantei Jinguuji Saburou - Kiken na Futari - Zenpen (Japan)