Wonder Boy III: Monster Lair is an arcade game released by Sega in 1987. It's part of the Wonder Boy series, known for its action-adventure gameplay and side-scrolling exploration. This set uses the System 16A hardware, originally developed by Sega. Several sets exist, differing in region and hardware revisions, resulting in some variations. The gameplay revolves around traversing levels, fighting enemies, and finding items. Sega is the developer and publisher of the original version. 

Wonder Boy III - Monster Lair (set 5, Japan, System 16A, FD1089A 317-0086)

Wonder Boy III - Monster Lair (set 4, Japan, System 16B, FD1094 317-0087 decrypted)