Unlike the original game, the updated version also allows for multiple solutions to puzzles and a new co-operative mode for two players. In the DS version, there is no voice acting, only subtitles. A version for iPhone and iPod touch was released on January 20, 2010. In May 2010, a version with higher resolution and a digital comic was released on the iPad. A PC version was released on August 27, 2010 on various digital distribution services.