@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		GameModel other = (GameModel) obj;
		if (HAS_PORTAL != other.HAS_PORTAL)
			return false;
		if (bank == null) {
			if (other.bank != null)
				return false;
		} else if (!bank.equals(other.bank))
			return false;
		if (currentPlanet == null) {
			if (other.currentPlanet != null)
				return false;
		} else if (!currentPlanet.equals(other.currentPlanet))
			return false;
		if (robot == null) {
			if (other.robot != null)
				return false;
		} else if (!robot.equals(other.robot))
			return false;
		return true;
	}