Not sure why it says that Mystery House is the "first game with an ending". Hunt the Wumpus from 6+ years earlier certainly has an ending (you catch the Wumpus)

Not sure why it says that Mystery House is the "first game with an ending". Hunt the Wumpus from 6+ years earlier certainly has an ending (you catch the Wumpus). Colossal Cave Adventure and mainframe Zork certainly do too. Adventure for the Atari 2600 and Star Raiders for the Atari 800 both predate it by a couple months. It's not even the first commercial home computer adventure game to have an ending, since quite a few of the Scott Adams adventures predate it. At a guess, I'd say it could be the first "graphical adventure game with a text parser interface", but I wouldn't swear to it.