The Castle
From Sega Retro
The Castle (ザ・キャッスル) is game developed by ASCII and released for the SG-1000 in 1986. It is a port of an MSX game of the same name, and is largely identical due to the similar hardware between the two machines. Due to the decline of the SG-1000 and emergence of the Sega Master System, the game was not released in Europe or Australia like many other SG-1000 games.
The game has a fairly standard plot of rescuing a princess from a castle, though the game itself was considered very large for the time. It also contains a map system similar to that of later Metroid and Castlevania games.
The Castle was followed by the MSX/NES game Castle Excellent later in the year.