Just found out about this competition, you can play once a day and don't need to buy anything in order to enter. Just click the "Click Here To Play Now" button, enter your email address and then wait for them to email you some receipt details you require to enter the competition. They are giving 490 away so you might as well give it a go.
Every time I play it's 2 stars and something else. It kind of feels gross. Like "You had no chance at all of winning, but we made it look like you were soooo close, keep trying, buy more Whoppers!" (Obviously I'm doing it for free, but I still get that feeling!)