Use Code 25453

(19) Grand Prizes (1 to be available each week during the promotion period). A "week" is defined as Monday through 11:59 p.m. ET on the following Sunday, except for the final week that ends at 5:00 p.m. ET on 1/25/08: A Wii™ console, ARV: $249.99 ea.;
(131) First Prizes (1 to be awarded each day during the promotion period): A sponsor-specified Wii video game, ARV: $49.99 ea.;
(131) Second Prizes (1 to be awarded each day during the promotion period): A Wii Points™ Card with a value of 2,000 points redeemable for downloadable content on the Wii Shop Channel, ARV: $20.00 ea.

http://www.dlblairsweeps.com/j8096/entry.form

I'm kind of new to this. What is the code used for?