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//Now the test pass. Here is what I found.

//there was a typo in the name of the properties
//dimentions -> instead dimensions
function GameObject(options) {
  this.createdAt = options.createdAt;
  this.dimensions = options.dimensions;
}

//For some reason this test gives a warning when 
// we write GameObject.prototype.destroy = function () {
//instead: GameObject.prototype.destroy = function destroy() {
GameObject.prototype.destroy = function destroy() {
  return ('Game object was removed from the game.');
};

function NPC(npcOptions) {
  GameObject.call(this, npcOptions);
  this.hp = npcOptions.hp;
  this.name = npcOptions.name;
}

//Here as the other functions you were passing a  aparam to takeDamage
//you shouldn't since there is nothing to pass.
NPC.prototype = Object.create(GameObject.prototype);
NPC.prototype.takeDamage = function takeDamage() {
  return (`${this.name} took damage.`);
};

function Humanoid(humanOptions) {
  NPC.call(this, humanOptions);
  this.faction = humanOptions.faction;
  this.weapons = humanOptions.weapons;
  this.language = humanOptions.language;
}

//Here you had the return between parentesis
//also you miss the dot at the end so that produce a missmatch in the test.
Humanoid.prototype = Object.create(NPC.prototype);
Humanoid.prototype.greet = function greet() {
  return `${this.name} offers a greeting in ${this.language}.`;
};

const hamsterHuey = new Humanoid({
  createdAt: new Date(),
  dimensions: {
    length: 2,
    width: 1,
    height: 1,
  },
  hp: 5,
  name: 'Hamster Huey',
  faction: 'Gooey Kablooie',
  weapons: [
    'bubblegum',
  ],
  language: 'Hamsterish',
});

hamsterHuey.greet();
hamsterHuey.takeDamage();
hamsterHuey.destroy();