private IEnumerator StartRoom()
{
audio.PlaySound(1); // collapse
yield return(new WaitForSeconds(audio.GetSoundLength(1)));
audio.PlayVoice(35); // "Hallo?"
yield return(new WaitForSeconds(audio.GetVoiceLength(35)));
// initialize pipes
lighting.SwitchToLights(Light.PipesLeft, Light.PipesRight);
Room.GetGame <PipesGame>().Initialize(GameDifficulty.Medium);
}