Walgreens is stocking an exclusive “Mystery Flavor” of Kellogg Co.'s Pringles and hosting a related promotion that awards $10,000 to one consumer who submits a receipt for the purchase of the 5.5-ounce SKU and also correctly identifies the flavor of chips inside.

Entrants must purchase the product from May 1 through July 30 and submit an image of the receipt on a promotional landing page within the Kellogg's Family Rewards website within two weeks of purchase (and by Aug. 13). Registration for the manufacturer’s loyalty program is required.

Kellogg plugged the promotion with Twitter and Facebook updates on June 7, and Walgreens subsequently reshared those posts the same day.

Walgreens identified the Mystery Flavor product as “only at Walgreens” with a feature in its June 9 circular, alongside promotion of special pricing and a complementary digital coupon for Pringles. The feature made no mention of the related promotion.

In stores, the partners are promoting the effort via endcap headers and shelf signage. The product's packaging also provides the details.