Wonder Boy in Monster Land, originally released in Japanese arcades in 1987 and later on the Sega Master System, has been listed on Steam by Retro Maniac, a developer with a limited portfolio. The title is misspelled as "Wonderboy," raising concerns about the legitimacy of the release. The ownership of the Wonder Boy franchise is split between LAT Corp, which holds the intellectual property rights, and Sega, which retains the trademark. This dual ownership complicates any re-release under the Wonder Boy name, as seen with previous titles that successfully navigated licensing agreements. The original arcade version was released as Adventure Island in the U.S., leading to confusion about the game's lineage. Concerns about the Retro Maniac port were raised by the Wonder Boy Universe fan account and composer Shinichi Sakamoto, who noted it is not available in Japan and may be unauthorized. The port appears to be a ROM running within the MAME arcade emulator. The listing is reportedly facing a DMCA takedown process initiated by Sega or LAT Corp.