DreamWorks Universe of Legends is a mobile app role-playing game developed by Firefly Game Inc., featuring more than 40 playable characters, including the Shrek characters.
The basic plot involves a hostile takeover from an unknown force of evil, which could destroy the DreamWorks multiverse. It's up to Po from Kung Fu Panda to gather all of the "Dreamstones" and restore the worlds to their normal selves.
Shrek's Swamp was one of the locations effected by this evil, which gave Lord Farquaad the ability to take over the land. Teaming up with Captain Hook, he is able to gather an army of witches to stop anyone from getting in his way.