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Nightfall Mysteries: Curse of the Opera is on sale for 2.99 as the weekly Big Fish Games Facebook Fan deal. This is a hidden object and is available for PC or Mac. It has a 4 star rating at Gamezebo. This deal lasts until the end of day Sunday, July 17th.
To get the $2.99 price you have to use the coupon code OPERAEXCL at checkout.