Burger King Adds Stacker 4 Whopper

Burger King Korea added three menu options, kicking off their Real Whopper Challenge with hamburgers that stack up.

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A post shared by 버거킹코리아 공식 인스타그램 (@burgerkingkorea)

The patties stack up from two to four, with the fast-food chain challenging customers to order a hidden menu item – the Stacker 5 Whopper.

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A post shared by 버거킹코리아 공식 인스타그램 (@burgerkingkorea)

Burger King Korea’s Real Whopper Challenge is at select locations in South Korea.

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