The present article is concerned with mirror symmetry for generalized K3
surfaces, with particular emphasis on complex and K\"ahler rigid structures.
Inspired by the works of Dolgachev, Aspinwall-Morrison and Huybrechts, we
introduce a formulation of mirror symmetry for generalized K3 surfaces. As an
application, we settle the long-standing problem of mirror symmetry for
singular K3 surfaces. Along the way, we investigate complex and K\"ahler rigid
structures of generalized K3 surfaces.Comment: restore some definitions, add some explanation