To be released alongside the movie, two games have been released for mobile phones. These games are called The Hitchhiker's Guide to the Galaxy: Adventure Game and The Hitchhiker's Guide to the Galaxy: Vogon Planet Destructor.
No information is currently available as to where they can actually be bought from. They may become available from the international official movie website - there is mobile content on the site and when one clicks on the link to games all that appears is text saying “Coming Soon” - as no other games have been announced, it is safe to assume that these games are what is being referred to here.
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