Jekyll Hakase no Houma ga Toki is a platform game developed for the Nintendo Entertainment System, originally released in Japan. It presents a unique gameplay experience by featuring different level sequences and greater difficulty compared to its Western counterpart, Dr. Jekyll and Mr. Hyde. Players navigate through various environments while managing the transformations of the protagonist.
The original Famicom version of the game known in the West as Dr. Jekyll and Mr. Hyde. The original version has a different stage order when compared to the international version, and it is also more difficult.