Burger King offers penny Whoppers at McDonald's

All you have to do is get within about 600 feet of a McDonald's and use Burger King's BK App to order a Whopper. Courtesy: Burger King / CNN
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(CNN) -- Burger King is trolling its biggest rival with a promotion available through the Burger King mobile app. For a limited time, you can order a Whopper for a penny, but you can only do it near a McDonald's.

Sound confusing? It's actually pretty simple.

All you have to do is get within about 600 feet of a McDonald's and use Burger King's "BK" app to order a Whopper. Then, drive to the nearest Burger King and pick up your sandwich - for just one cent.

The promotion is called the "Whopper Detour" and runs through Tuesday, December 12th.

Burger King launched the promotion with a video showing people trying to pick-up their Whoppers at McDonald's drive-through windows.