As players descend 100 floors, they discover the dungeon is actually a massive pink blob—revealed to be Princess Bubblegum’s parents—which has expanded over a millennium, inadvertently pushing prisoners out.

The story begins with summoning the heroes of Ooo to investigate the Secret Royal Dungeon beneath the Candy Kingdom.

Prisoners have been mysteriously escaping from a dungeon deemed inescapable. Bubblegum admits she "doesn't know" why, prompting the game's title.

The game adopts a top-down perspective reminiscent of retro titles like Gauntlet .

Players can choose from characters including Finn, Jake, Marceline, Cinnamon Bun, Ice King, Flame Princess, and Lumpy Space Princess.

While praised for its authentic voice acting and 16-bit sprite aesthetic, the core gameplay was heavily panned. Adventure Time: Explore the Dungeon Because I DON'T KNOW!

Each character possesses unique traits. For example, Marceline and Jake can float over pits, while Finn is a balanced "jack-of-all-trades".