Just don't do it! I signed my son up for a 1 year subscription since he was having fun with the free games and wanted access to the rest of the games. Unfortunately, the games quickly became boring, and we have had endless problems logging on to the site on his iPad, the website often simply doesn't load.
To make matters worse, there's no way to get out of the 1 year subscription except by cancelling (no refunds at all) and if you don't cancel you will be automatically be charged again next year.
Totally shady business, poor website, really overpriced.