These are my ZBrush models for the BlasterMaster remake. I included the sphere based models for those that I still had on my HD. I'd recommend exporting a low poly (2-5k polys) to use for in-game and the highest detail level (1 million+ polys) as the base for the normal map. I was able to successfully use this technique by exporting to OBJ format and using an old version of nVidia's Melody tool to generate the normal maps.
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