CHICAGO — Some McDonald’s Happy Meals are taking a leap into the 21st century.

McDonald’s Sweden has developed “Happy Goggles,” a kind of cardboard virtual reality headset that’s made from the Happy Meal box.

The headset – which one assumes has the subtle smell of French fries – is designed to hold a smartphone, on which kids can play a downhill skiing game designed specifically for the contraption.

The special Happy Meal boxes will only be available for a week, from March 5 to 12, but the offer may be expanded.

The promotion is being used to mark the 30th anniversary of Happy Meals in Sweden.