Adventure Time: Explore the Dungeon Because I Don't Know!

The game begins with Princess Bubblegum entreating the player (as one of the various playable characters) to investigate the large and secret Royal Dungeon that lies below the Land of Ooo. Several prisoners have been escaping, but as the prison is supposed to be impossible to escape, Bubblegum is stumped as to how the prisoners are escaping and entreats the player to explore the dungeon because "I don't know". As the game progresses several characters are unlocked and become playable characters through various situations. It is briefly suspected that Ice King is releasing the prisoners, but he is shown to have only been in the dungeon to create large Fiona and Cake ice statues. The game eventually leads up to a battle between the player(s) and a giant pink blob that is revealed to be Princess Bubblegum's parents. About a thousand years ago she was gestated within the blob and was later expelled from its mass. Bubblegum explains that she grew up to become more independent and became a princess. She kept the blob in the Royal Dungeon, but over time the mass expanded and inadvertently released the prisoners. This causes the Ice King to angrily demand to know how old Bubblegum is and she replies that she is 827 years old, which horrifies him. Finn questions Bubblegum's rationale for covering up the secret of her parents, only for Marceline to defend Bubblegum by saying that the others would have done the same for their parents. However, as a result of the player's fight against the blob, it is unable to reform and turns into a set of bubbles, one of which kisses Bubblegum on the cheek.