The game begins with
Finn camping in the rain. He hears the voice of
Jake who tells him to venture into a nearby castle dungeon. Jake then reveals he was inside Finn's pocket, and as the two venture through the tutorial dungeon, Finn and Jake recall that they were sent to the kingdom they're currently in, the Nameless Kingdom, on an important mission by Princess Bubblegum. Eventually reaching the castle's main hall, Finn and Jake encounter a butler who informs them of their quest: they must rescue the 3 princesses of the kingdom in preparation for the upcoming coronation. Finn and Jake rescue the first two princesses, Lullaby and Slumber Princess, relatively easily. However, the third princess, Nightmare Princess, reveals after being rescued that she is the reason why the princesses have gone missing, and takes over the entirety of the Nameless Kingdom, declaring it the Nightmare Kingdom. Finn and Jake must then venture into the castle once again, then fight Nightmare Princess. After defeating her, they are presented with the choice of whom to crown the ruler of the Nameless Kingdom, which was their assignment all along. Selecting Lullaby or Slumber Princess results in a unique "side" ending, but selecting Nightmare Princess is the true ending. ==Development==