Wieden + Kennedy sent packages of bulletstorm musubi* to various video game bloggers to promote upcoming shooter Bulletstorm. You can see how they made the packages here.
Of course, such antics really aren't necessary. The game's by the makers of Gears of War and gameplay sells itself:
*Spam musubi is delicious.
*Previously: Coca-Cola ARG by W+K.
*Buy advertising collections at Amazon.