public void DetectColl()
        {
            List <Entity> dead_Badguy       = new List <Entity>();
            List <Entity> dead_playerBullet = new List <Entity>();

            //loop through
            //Entities vs. player
            foreach (Entity enemy in current_Enemies)
            {
                if (enemy.hitbox.IntersectsWith(player.hitbox))
                {
                    if (player.HitPlayer(enemy))
                    {
                        var sound = new MediaPlayer();
                        sound.Open(new Uri(System.Environment.CurrentDirectory.Substring(0, System.Environment.CurrentDirectory.Length - 9) + "Resources\\hurtplayer.wav", UriKind.Absolute));
                        Application.Current.Dispatcher.BeginInvoke(new Action(() => sound.Play()));
                    }

                    if (enemy.Hit())
                    {
                        dead_Badguy.Add(enemy);
                    }
                    if (enemy is Powerup)
                    {
                        player.powerup = (enemy as Powerup).type; // Added by Jo

                        if ((enemy as Powerup).type == PowerUp.ExtraLife ||
                            (enemy as Powerup).type == PowerUp.ExtraBomb)
                        {
                            player.Activate_powerup();
                        }

                        dead_Badguy.Add(enemy);
                    }
                }
            }
            //Player Bullets vs. entities
            foreach (Entity bullet in player_fire)
            {
                foreach (Entity enemy in current_Enemies)
                {
                    if (bullet.hitbox.IntersectsWith(enemy.hitbox))
                    {
                        dead_playerBullet.Add(bullet);
                        bullet.Hit();
                        if (enemy.Hit())
                        {
                            var sound = new MediaPlayer();
                            sound.Open(new Uri(System.Environment.CurrentDirectory.Substring(0, System.Environment.CurrentDirectory.Length - 9) + "Resources\\damage.wav", UriKind.Absolute));
                            Application.Current.Dispatcher.BeginInvoke(new Action(() => sound.Play()));

                            dead_Badguy.Add(enemy);
                            score += 50 * 1; // TODO: Based on DIff
                            if (enemy is Powerup)
                            {
                                player.powerup = (enemy as Powerup).type; // Added by Jo // copyed Noah
                                if ((enemy as Powerup).type == PowerUp.ExtraLife)
                                {
                                    player.Activate_powerup();
                                }
                            }
                        }
                    }
                }
            }
            foreach (Entity e in dead_Badguy)
            {
                current_Enemies.Remove(e);
            }

            foreach (Bullet b in dead_playerBullet)
            {
                player_fire.Remove(b);
            }
        }