public void CheckCollisions()
        {
            _CollisionRobots = new List <Robot> ();

            foreach (Robot robots in _Robots)
            {
                if (_Player.CollideWith(robots) || robots.IsOffScreen(_GameWindow))
                {
                    _CollisionRobots.Add(robots);
                }
            }

            foreach (Robot newRobots in _CollisionRobots)
            {
                _Robots.Remove(newRobots);
            }
        }