This is a commentary on the celebrated Navya Nyāya text Tattvacintāmaṇi composed by Gaṅgeśa Upādhyāya. This commentary is called Tattvacintāmaṇirahasya. It is familiarly known in Bengal as Phakkikā or Māthurī. This MS consists of the text up to Anyathākhyātivādarahasya of the Pratyakṣakhaṇḍa. 119th and 142nd folios are damaged. Extent and format of original and physical characteristics: 172 Folios; Incomplete MS.; Extremely fragile. The original size of the folios are 40X7 cm. Author: Mathurānātha Tarkavāgīśa. The place of composition of this manuscript is Bengal.