Extra10 new adverts page bar!

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Hello, Extra10 members! Have you noticed the new advert page layout of extra 10? They have this bar above the ads which has series of numbers. You have to click the correct code after you finish viewing the page. Why did they do that? Anyone here knows about it? Is it fine with you to have that bar? I prefer the older page because this clicking will only eats our time, right? Please share your views. Thanks!