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Sony Pictures acquired the film rights to Sonic the Hedgehog from Segain 2013, and officially gave the green-light at a private joint Sega/Sony Pictures press conference announcing the film on 10 June 2014.
On 3 December 2013, Sony Pictures Digital Domain Names, Inc., a division of Sony Pictures Entertainment, filed a notice of registration for three inactive websites adressed as "SonicTheHedgehog-Movie.com", "SonicTheHedgehog-Movie.net" and "SonicTheHedgehogMovie.net". The registrations were reported by The Sonic Stadium on 7 December, but neither Sony Pictures nor Sega confirmed the existence of a proposed film project at the time of the domains' registrations.
On 20 March 2014, a film adaptation was first hinted when The Tracking Board released a rumor about the film, stating that it would receive a "Dark Knight treatment" and posted a writer shortlist of proposed writers involved. On 10 June 2014, the official Sonic website was updated, with a locked section listing "TV and Movies." Later that same day, at a private Sega/Sony Pictures press conference, The Hollywood Reporter reported the confirmation of the film, and that Sony had green-lit the project.
It was revealed on 21 June 2014 that Sonic the Hedgehog and its eventual successor films will be a separate continuity from the Sonic Boom continuity. On 19 November 2014, Van Robichaux stated that the film production team is "aiming for [a] PG-13 [rating]".