'Sonic the Hedgehog 3' was "trickier" to make than the first two films.
Creative partnership Pat Casey and Josh Miller have written the screenplays for all three instalments of the franchise - which is based on Sega's iconic video game series of the same name - and explained that the whole process was still "fun" but became a bit more difficult with the inclusion of new antagonist Shadow (Keanu Reeves).
