It should not work due to region lock on the Japanese version of the main unit, but it was displayed in My Games and playable if selected from there. It could not be launched from the disc menu. After investigating, it seems the "Jewel of the Nile DLC pack" is installed from the disc launch screen, so it appears the DLC cannot be installed on the Japanese version, which cannot be launched from the disc menu. Also, the manual does not seem to be included from the beginning. Only those who understand this, please.