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Signal-To-Noise Uncovering Dark Skies - 2010 was released on:
USA: 9 December 2010
same as dark matter
Undead Noise - 2012 Dark Fairy Tales 2-6 was released on:
USA: 27 June 2012
they will go to sleep when it is dark and there cage is covered with a towel and there is no noise
one is sold byildkat the rest are random drops from boss noise on ultimate