We've been wondering for two months when we would find out the true identity of the 'Mystery Oreo' cookie flavor. Tuesday was the day.

Oreo made the announcement on Facebook: It was a mystery for the ages. That is, the stone ages. The Mystery OREO cookie flavor is FRUITY PEBBLES TM cereal.

After debuting the Mystery flavor in October, Oreo also launched a sweepstakes encouraging fans to submit their own guesses online or via text message, with a $50,000 grand prize at stake. The contest ended on Nov. 30 but a winner has not been announced.

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Many of you guessed Fruity Pebbles correctly on the spot. Others suggestions on social media included Fruit Loops, lemonade, and Fruit Stripe gum.

Our resident Oreo connoisseur, WKYC Executive Producer Julie Flynn had it nailed (or so she says!).

That was also the case for the NBC TODAY Show's Kathie Lee Gifford and Hoda Kotb when they sampled the Mystery Oreo in early October.