In 2007, Naughty Dog began work on the Uncharted series, and made their first approach to realistic worlds and characters, in contrast to their Crash Bandicoot and Jak and Daxter series, which featured fantastical worlds set in a fictional setting. The Uncharted franchise has been praised for its cinematic quality and technical proficiency, and has sold nearly 17 million copies worldwide as of April 2012.[18]