public void Do()
{
if (_is_playing)
{
_Time_Since_Start += Time.deltaTime * 1000;
if (_Time_Since_Start > _length)
{
OnEnd();
}
foreach (HitObject HO in HitObjects)
{
if (HO._is_hittable)
{
if (HO._offset + HO._size < _Time_Since_Start)
{
HO.OnKill();
++_miss;
}
}
}
}
}