This version of Wonder Boy III: Monster Lair is a variation running on a System 16B arcade board and originating from Japan, suggesting a later release or a hardware upgrade from the earlier System 16A version. Decryption details suggest potential ROM alterations.

Wonder Boy III - Monster Lair (set 2, Japan, System 16B, FD1094 317-0085 decrypted)

Wonder Boy Deluxe