This is the later version (Revision B) of DRAGON QUEST Ⅲ. Operation has been confirmed. Saving is currently possible, but the backup battery is not guaranteed. There are early and later ROM versions of FC Dragon Quest 3. The later ROM has a "B" marking on the upper right of the back. Also, the surface of the cartridge is rough. The later ROM has a cheat code: holding the A button on controller 2 while walking on the field prevents random enemy encounters, known as the "no encounter trick."