The "Lucky Charms Marshmallow Only Sweepstakes" runs through the end of the year and you can enter with a code from inside specially-marked Lucky Charm cereal boxes (pictured left) which can be found at retailers nationwide.
If you have a winning code, they'll mail you a limited-edition Lucky Charms Marshmallow Only box (pictured right) in a few weeks after you enter the code. You can enter the code at MarshmallowOnly.com.
Photo via General Mills.
