Is the Pinterest Scavenger Hunt a scam?

I clicked on a pin, and was directed to a page telling me I’d found the scavenger hunt prize and asking me to choose the gift card(s) I wanted to receive. Here’s a screen shot of the page.

I strongly suspect this is not legit. It just doesn’t feel quite right, and the wording seems a little off. Is there a way to know for sure? The URL address for the scavenger hunt page is http://www.pinterest-in.com/pin/, if that helps.