Text based adventure.

gistfile1.js

// set up the rooms/scenes
var Prompts = { A: "You are in room A. The doors are B, C.",
                B: "You are in room B. The doors are A, D.",
                C: "You are in room C. The doors are A, D.",
                D: "You are in room D. The doors are B, C."
              };
              
// start here
var response = prompt(Prompts['A']);

while (response != "X") {
	response = prompt(Prompts[response]);
}

alert("You have been eaten by a Grue!");