All you have to do is sign up, take a picture on your cell phone, and email it from your phone to their site. I've set it up so my photo then uploads automatically from playlookit to twitter. Rules are you have to take the photo the day of the challenge and don't take photos of screens (computer/tv/etc). Other than that you can't make a wrong choice. Todays challenge is bowl...and I'm on the hunt for a great one :)