Search was: year = 1977
Mainframe adventures: ADVENT / Adventure (aka Colossal Cave) (1972-1977)
Mainframe adventures: Zork (aka Dungeon) (1977-1979)
Mainframe adventures: Mystery Mansion (1977 or something like that (reports vary from 1976 to 1980))
3 games match your query.
Adventureland was created by Hans Persson and is now maintained by Stefan Meier.
If you find any errors or have information that is missing, please let me know.