The Guide for the Perplexed
Rosen's works include responsa and novellae on Torah and Talmud. They are regarded as difficult and inaccessible, as he employs the philosophical terminology of Maimonides' "The Guide for the Perplexed" even in non-philosophical analyses. Kasher, therefore, included "Mefa'aneach Tzefunoth" (Decipherer of Secrets), an explanatory commentary to facilitate understanding of Rosen's influential work.