 Complete the following phrase:  Sega trademarked the title Sonic Lost World in May 2013. The game was revealed on May 17, 2013 in a Nintendo Direct announcement, as part of an exclusive partnership between Sega and Nintendo for the Sonic the Hedgehog series. It is one of three games in this partnership, the other ones being the fourth entry to the Mario  Sonic at the Olympic Games series, and , a game based on the Sonic Boom animated series. Sega reported that more on the game would be revealed before 