Conquering one of Piece of Cake's 55+ stages requires making intelligent matches on its match-three game board, which guides the actions of your party's Warrior, Ranger, Worker and Priest. Pieces are attributed to different skills: matching three hearts will have the Priest use healing magic, for example. All puzzle-based progress is translated into an above battle against the blue army in a scene that's reminiscent of the series' established gameplay.
In a game featuring extensive portions, Piece of Cake's bonus feels fitting: the App Store and Google Play descriptions notes that after clearing level 15, players with a linked Facebook account will "earn access to a download of Fat Princess for your PS3 system at no additional cost." Assuming that amount of progress is feasible without purchasing power-ups or character upgrades, that's a pretty sweet deal.