The Stanley Parable

The Stanley Parable is an interactive drama and walking simulator designed and written by developers Davey Wreden and William Pugh. The game carries themes including choice in video games, the relationship between a game creator and player and predestination/fate. 

The player guides a silent protagonist named Stanley. As the story progresses, the player is confronted with diverging pathways. The player may contradict the narrator's directions, which if disobeyed will then be incorporated into the story. Depending on the choices made, the player will encounter different endings before the game restarts to the beginning.

(Source: Wikipedia)