 Test of the Twins" appeared for several weeks on "The New York Times" best seller list from October 12, 1986, to November 2, 1986.Ian Hewitt, a staff reviewer from d20zines.com, stated the novel "gratifying and compellingly exciting climax to the trilogy" and awarded it an A+ rating.He mentioned that the book had to be taken in the context with the other two novels and is not a stand-alone read.