THIS IS THE ENTIRE VOID"
private void Cleanup()
        {
            if (Bulletlist.Count > 0)
            {
                foreach (Bullet bullet in Bulletlist) // 'in' causes Error
                    Bulletlist.Remove(bullet);
            }
            if (NPCList.Count > 0)
            {
                foreach (NPC soldier in NPCList)
                    NPCList.Remove(soldier);
            }
        }