English: From the source,

Photograph of Karim-ud-Dins mosque from the Archaeological Survey of India Collections taken by Henry Cousens in the 1880s. The Karim-ud-Din Mosque is situated in the south east part of the citadel and dated 1320 from an inscription, it is the earliest dated mosque in Bijapur.

It is not a Hindu temple converted to a mosque, but a mosque constructed in style of a Hindu temple reusing material from broken Hindu temples

The mosque was built with material taken from old Hindu structures. The entrance porch is the mandapa of the temple already existing. The central area of the prayer hall, which is raised above the other areas, is resting on pillars of various design piled one upon the other.