We present results from an inductive algebraic approach to the systematic construction and classification of the ‘lowest-level’ CY 3 spaces defined as zeroes of polynomial loci associated with reflexive polyhedra, derived from suitable vectors in complex projective spaces. These CY 3 spaces may be sorted into ‘chains’ obtained by combining lower-dimensional projective vectors classified previously. We analyze all the 4242 (259, 6, 1) two- (three-, four-, five-) vector chains, which have, respectively, K3 (elliptic, line-segment, trivial) sections, yielding 174767 (an additional 6189, 1582, 199) distinct projective vectors that define reflexive polyhedra and thereby CY 3 spaces, for a total of 182737. These CY 3 spaces span 10827 (a total of 10882) distinct pairs of Hodge numbers h 11 ,h 12 . Among these, we list explicitly a total of 212 projective vectors defining three-generation CY 3 spaces with K3 sections, whose characteristics we provide.